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  • A Tale of Two Caves: How Is Hurricane Crawl Cave Different From Crystal Cave?
The cover for the 'Tale of Two Caves' article. The main image is a photo of a person standing in a small passageway of a cave.
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A Tale of Two Caves: How Is Hurricane Crawl Cave Different From Crystal Cave?

  • Article
  • Middle School
  • 1 Classroom Period
  • Active Forest Management
  • Water
  • Cave
  • Cave Formations
  • Dye Tracing
  • Geology
  • Kings Canyon National Park
  • Sedimentation
  • Sequoia National Park
The cover for the 'Tale of Two Caves' article. The main image is a photo of a person standing in a small passageway of a cave.
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Caves are important natural features in Sequoia and Kings Canyon National Parks in California. Past studies of some of these caves revealed information about the area’s mountains, the formation of caves, and the age of rocks. The scientists in this study were interested in two particular caves, Hurricane Crawl Cave and Crystal Cave.

The scientists knew that Hurricane Crawl Cave developed under similar conditions to Crystal Cave because they are located near one another. However, the scientists noted that Hurricane Crawl Cave had a different morphology, or structure, than Crystal Cave. Crystal Cave has many levels and mazes, but few canyons. The scientists wanted to know why the morphology is different between Hurricane Crawl Cave and Crystal Cave.

A Tale of Two Caves: How Is Hurricane Crawl Cave Different From Crystal Cave?

Jump To

  • Meet the Scientists
  • Thinking About Science
  • Thinking About the Environment
  • Introduction
  • Methods
  • Results
  • Discussion

Meet the Scientists

Joel Despain

Hydrologist

My favorite scientific experiences involve understanding the geomorphic history of a given cave or cave area. Some geomorphic questions are, “Why did the cave form, and why did it form... Read Full Bio

Benjamin Tobin

Hydrologist

Each science experience is amazing, interesting, and fun in its own way. If I had to choose, however, my favorite would be conducting dye traces at the Grand Canyon. This... Read Full Bio

Greg Stock

Geologist

My favorite science experience was mapping caves in Sequoia with Mr. Despain. We used those maps, along with dated sediment in the caves, to determine long-term river downcutting rates. The... Read Full Bio

What Kind of Scientists Did This Research?

  • Hydrologist: A scientist who studies water and the water cycle.
  • Geologist: A scientist who studies Earth, the materials of which Earth is made, the structure of those materials, and the processes acting upon them

Thinking About Science

Science, whether conducted indoors or outdoors, requires some safety precautions. For example, scientists use gloves and safety glasses when using chemicals in a laboratory. A forester may use safety glasses, a hard hat, and boots when working outside in the forest (figure 1). Before starting any activity in science, scientists first evaluate whether they need special equipment to ensure their safety.

A forester measuring a tree wearing appropriate safety gear
Figure 1. A forester may use many pieces of equipment to be safe when conducting research. What pieces of safety equipment can you identify in this photo?
Photo USDA Forest Service photo by Natalie Van Doorn

 

The scientists in this study conducted their research in a cave. They needed safety gear specific to the cave environment, such as warm clothes, hard hats, gloves, headlights, and boots. As you read this article, remember to look at the photos of scientists in caves. What safety equipment are they wearing?

 

Safety, however, is more than just about equipment. Good communication also is important to safety. Whether inside or outside, scientists must communicate when, where, and how they are conducting an experiment. To safely conduct the study described in this monograph, the scientists needed to communicate where and when they were going into the cave. This basic information ensured that the scientists could be helped if a problem occurred.


Thinking About the Environment

Water moves through and across Earth in a cycle, called the water cycle (figure 2). Water can change as it moves through the water cycle. Water may change forms between a liquid, a solid, and a gas.

 

An illustration of the water cycle in a forested area
Figure 2. Water moves through and across Earth in the water cycle.
FIND Outdoors illustration by Stephanie Pfeiffer

 

Water also can change when it interacts with chemicals within the environment. For example, interactions between water and chemicals can result in the development of caves. Many caves in the United States are formed when groundwater or rainfall absorbs carbon dioxide. The combination of water and carbon dioxide forms carbonic acid, which is slightly acidic. Over time, the water enters cavities in the rock and slowly dissolves the cavities creating larger open areas.

 

This process also contributes to the formation of speleothems (figures 3a-3c). The slightly acidic water moves through rocks, dissolving calcite. The water has large amounts of carbon dioxide in it when it enters the cave. The cave air, however, only has a small amount of carbon dioxide, so some or all of carbon dioxide from water is released into the air. This process is similar to when you open a can of soda and the carbon dioxide creates bubbles as it leaves the liquid. The calcite is unable to stay in the water without carbon dioxide, so it is deposited onto cave floors, ceilings, and walls forming speleothems.

 

 

Speleothems hanging down from a cave ceiling

Figure 3a.

Speleothems hanging down from a cave ceiling and floor

Figure 3b.

Speleothems hanging down from a cave ceiling

Figure 3c.

Figures 3a-3c. Speleothems come in many different shapes and sizes . You may have heard of some speleothems, like stalactites and stalagmites . Many other speleothems have interesting names, like soda straws, moonmilk, bacon, draperies, frostwork, cave popcorn, snottites, and curly fries.

Under Earth Images photos by Dave Bunnell

The scientists in this study found many different speleothems during their research, including large shields, rimstone pools, folia, spar crystals, curtains, and helictites. Some of the speleothems grew so large that they affected the movement of water and sediments through the cave. Speleothems illustrate a portion of the water cycle, as well as how chemicals, like calcium, cycle through the environment.


Introduction

Caves are important natural features in Sequoia and Kings Canyon National Parks in California (figure 4). Past studies of caves in the area have focused on two of the largest caves, Lilburn Cave and Crystal Cave. Studies of these caves revealed information about the area’s mountains, the formation of caves, and the age of rocks.

A map of the United States highlighting the Sequoia and Kings Canyon national parks
Figure 4. Sequoia and Kings Canyon National Parks are located in the central part of California. FIND Outdoors Map by Carey Burda and Stephanie Pfeiffer

Another large cave in the area is Hurricane Crawl Cave. Hurricane Crawl Cave was first explored in 1988. Scientists mapped the cave’s approximately 2 miles of passages between 1988 and 1995. The cave has two entrances, multiple levels, two canyons, two mazes, and one large room (figures 5).

A figure graphic of the Hurrican Crawl cave
Figure 5. Mazes are located near both entrances to Hurricane Crawl Cave. Canyons, named Dusted Canyon and Carotene Canyon, are located near the mazes. The room, called Pumpkin Palace, is located in the middle of the cave.                          FIND Outdoors illustration by Stephanie Pfeiffer.

 

The main stream that passes through the cave is a sinking stream. This stream starts on Earth’s surface, enters the cave for a period of time, and then returns to Earth’s surface further downhill (figure 6).

A sinking stream feeding into a cave
Figure 6. A sinking stream is a stream that flows below Earth’s surface for some of its length. This sinking stream is about to go underground at Russell Cave National Monument in Alabama.
National Park service photo by of Dale L. Pate.

 

The scientists knew that Hurricane Crawl Cave developed under similar conditions to Crystal Cave because they are located near one another. However, the scientists noted that Hurricane Crawl Cave had a different morphology, or structure, than Crystal Cave. Crystal Cave has many levels and mazes, but few canyons. The scientists wanted to know why the morphology is different between Hurricane Crawl Cave and Crystal Cave.

Reflection Section

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Methods

To better understand Hurricane Crawl Cave, the scientists collected data regarding the cave’s age. A previous study estimated the age of a rock from inside Hurricane Crawl Cave. From the rock’s location, the scientists measured to the top of the cave and to the bottom of the cave. These measurements enabled them to estimate how long it took for the cave to develop both before and after the rock was deposited.

The scientists also collected information about the past and present movement of water through the cave. Current information about the flow of water was gathered between 2010 and 2012. Specifically, the scientists measured water discharge. The water discharge measurements were taken twice per year at the same location inside the cave, once during June and once during October (figure 7).

 

A illustration showing a scientist using a pygmy meter in a stream of water
Figure 7. The scientists measured water discharge with a pygmy (pig mē) meter. A pygmy meter is placed in a stream and the
water spins the bucket. The number of times
the bucket spins in a specific amount of time
helps determine the flow of water. FIND Outdoors illustration by Stephanie Pfeiffer.

The scientists also conducted a dye trace (figure 8). A dye trace involves putting a non-harmful, colored dye in water. Scientists then track and observe the dye to understand the movement of water. Previous research indicated one stream that passed through the cave. In this study, the scientists used a dye trace on multiple streams to confirm if any other streams passed through the cave.

 

A scientist dumping dye into a body of water for the experiment
Figure 8. Scientists used a dye trace to track the
movement of water.                                        U.S. Geological Survey photo.

The scientists then chose four transects within Hurricane Crawl Cave to collect data about past water discharge (figure 9).

A graphic of the transect locations in Hurricane Crawl Cave as viewed from the side
Figure 9. The transect locations in
Hurricane Crawl Cave as viewed from the
side. FIND Outdoors illustration by Stephanie Pfeiffer

Information about cave scallops and stream cobbles were collected at each transect (figures 10 & 11). You may have heard of animals called scallops, which live in the ocean, but cave scallops are nonliving. Cave scallops are asymmetrical, scoop-like formations on cave surfaces formed by water. Scallops can indicate the direction of water flow and the velocity of water. Stream cobbles are rocks that are carried in the flow of water. A mathematical formula enabled the scientists to determine the velocity of water needed to move the stream cobbles. A total of 327 scallops and 157 stream cobbles were measured across the four transects.

Scallops on the ceiling of a cave with a scientist walking through the cave

Figure 10. Scallops, like the ones pictured here
on the ceiling and wall of the cave, can indicate
the water velocity. Large scallops indicate slower
flow of water, while small scallops indicate faster
flow of water.

Under Earth Images photo by Dave Bunnell.

Stream cobbles in a cave

Figure 11. Stream cobbles, like those at this person’s feet, are often carried into and through a cave by water. The scientists measured the largest cobbles along each transect because they suggest the maximum velocity of the water.

Under Earth Images photo by Dave Bunnell.

Reflection Section

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Results

The scientists’ observations, combined with the estimated age of the rocks, indicated that Hurricane Crawl Cave is approximately 1.4 million years old. Recall that the scientists also wanted to compare past and present water discharge in the cave.

Scallop measurements at the four transects indicated that the direction of water flow is similar between the past and present. Scallop measurements and stream cobbles both indicated that past discharge of water was greater than current discharge (table 1 and figure 12). Past discharge did not vary across the four transects. Instead, past discharge varied by passage type. Specifically, the wide, upper passages of the cave had very high discharge in the past.

 

Am illustration showing a one meter cube compared to a gallon of milk
Figure 12. The scientists measured discharge
in meters cubed per second. One meter cubed
is equal to about 264 gallons. FIND Outdoors illustration by Stephanie Pfeiffer.

 

When the scientists completed the dye trace, they found that one sinking stream could be traced through the cave. This finding confirmed previous research results. However, they also found other streams that began in the cave.

A graphic of a table

Table 1. Mean past discharge was different depending on the type of passage being
measured. However, mean past discharge in all passages was higher than current discharge. The scientists measured the water discharge in meters cubed per second, or m3 s-1.

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Discussion

The scientists determined that Hurricane Crawl Cave likely formed under two different conditions over the past approximately 1.4 million years. First, the wide, upper passages were formed at a time when the cave passages were full of water. The slightly acidic water sloshed like water in a pool, slowly enlarging the passages. Second, the narrow parts of the cave, like canyons and mazes, were formed as water moved downhill under the influence of gravity. The slightly acidic water and the stream cobbles also helped to enlarge the passages. This condition is most similar to what is occurring in the cave today.

 

In both of these past conditions, the highwater discharge was likely because climate conditions were different than current climate conditions. Past climate was cooler and wetter than at the present.

 

Although Hurricane Crawl Cave and Crystal Cave are located near one another and developed under similar conditions, their morphologies differ. The scientists concluded that the differences in morphology are likely a result of differing amounts of sediment transported through the caves.

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Adapted from Despain, J.D., Tobin, B.W., and Stock, G.M. 2016. Geomorphology and paleohydrology of Hurricane Crawl Cave, Sequoia National Park, California. Journal of Cave and Karst Studies. 78, 2: 72-84.

The cover for the Natural Inquirer Caves and Karst journal. The main image is a photo of a cave with an opening high above the land below with a view of a green valley.

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Read Distraction Free Download PDF
  • PDF preview of 'Tale of Two Caves' FACTivity.
    In this FACTivity, you will grow your own speleothem. At the end of this FACTivity, you answer the following question: What does this activity tell us about the formation of...

    FACTivity – A Tale of Two Caves

    • Activity
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    • Carbon
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    • Cave Formations
    • Hands-on
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    • Speleothem
    In this FACTivity, you will grow your own speleothem. At the end of this FACTivity, you answer the following question: What does this activity tell us about the formation of...
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Standards addressed in this Article:

The Next Generation Science Standards (NGSS) are a set of K-12 science education standards emphasizing inquiry-based learning, real-world applications, and integrating engineering practices, aiming to deepen understanding of science while promoting critical thinking and problem-solving skills.
  • ESS2.A-M2
    The planet’s systems interact over scales that range from microscopic to global in size, and they operate over fractions of a second to billions of years. These interactions have shaped Earth’s history and will determine its future.
  • ESS2.C-M1
    Water continually cycles among land, ocean, and atmosphere via transpiration, evaporation, condensation and crystallization, and precipitation, as well as downhill flows on land.
  • ESS2.C-M5
    Water’s movements—both on the land and underground—cause weathering and erosion, which change the land’s surface features and create underground formations.
The Common Core Standards are educational benchmarks in the United States that outline clear expectations for what students should know and be able to do in English language arts and mathematics from kindergarten through 12th grade, aiming to ensure consistency and coherence in education nationwide.
  • Cite specific textual evidence to support analysis of science and technical texts.
  • By the end of grade 8, read and comprehend science/technical texts in the grades 6-8 text complexity band independently and proficiently.
  • Determine the central ideas or conclusions of a text; provide an accurate summary of the text distinct from prior knowledge or opinions.
  • Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.
  • Determine the meaning of symbols, key terms, and other domain-specific words and phrases as they are used in a specific scientific or technical context relevant to grades 6-8 texts and topics.
  • Analyze the structure an author uses to organize a text, including how the major sections contribute to the whole and to an understanding of the topic.
  • Analyze the author's purpose in providing an explanation, describing a procedure, or discussing an experiment in a text.
  • Integrate quantitative or technical information expressed in words in a text with a version of that information expressed visually (e.g., in a flowchart, diagram, model, graph, or table).
  • Distinguish among facts, reasoned judgment based on research findings, and speculation in a text.
  • Compare and contrast the information gained from experiments, simulations, video, or multimedia sources with that gained from reading a text on the same topic.
Social Studies Standards are educational guidelines outlining the essential knowledge, skills, and concepts students should learn in subjects such as history, geography, civics, and economics, aiming to provide a comprehensive understanding of societal structures, historical events, and global perspectives.
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What Is a Natural Inquirer Journal?

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A Natural Inquirer journal is a collection of 4-8 articles on a related science topic. Journals are written for a middle school audience, but they can also be adapted for both high school students and advanced upper elementary students. Some journals are particularly suited to high school students; you can find our grade level recommendations in the tags on the product page or by filtering journals by grade level.

Journals include:

  • Four to eight articles based on published, peer-reviewed research papers; the articles keep the research paper format (see more below) but are written in language students can understand.
  • A FACTivity for each article, which is an activity to complete after reading the article. The FACTivity helps reinforce major science concepts from the article. These activities are designed to be easy to implement, with few material requirements and options for adapting them for your audience or available resources. Some articles in a journal may have two FACTivities.
  • A short “Welcome to the journal” article about key background information and science concepts that unify the articles included in the journal
  • A glossary of new terms for each article and the introductory materials.
  • A list of related Natural Inquirer publications for each article as well as outside references.
  • Standards correlations, including Next Generation Science Standards, addressed in the articles and the FACTivities.

Journals may also include additional essays (called spotlights), other activities (like crossword puzzles or vocabulary challenges), and more.

 

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Reading Modes

Journals are available in three different formats:

  • Hard copies can be ordered from the website and shipped, all free of charge.
  • PDF versions of the printed journal can be downloaded free on the website. The PDF version directly replicates the content and layout of the printed version. You can also download individual articles as pdfs.
  • The “Read Distraction Free” option allows the individual articles to open in their own window, without the rest of the website being visible. These articles can be found under the “Articles” tab. This version allows readers to scroll to particular sections of the article using the sidebar menu on the left side of the screen. This version also has interactive Reflection Sections and Number Crunches. Students can enter their answers, submit them, and then receive the correct answers to double-check their work. Submitted answers are not saved on the website and will disappear once the window is closed.

What's in a Natural Inquirer Article?

Here, we'll go into more detail about the parts of a Natural Inquirer article and give you some ideas about how they can be used.
  1. Meet the Scientists

    This section introduces the scientists (and others) who worked on the study. In their own words, they each share a memorable science experience, a favorite research project, or something they learned during the course of their education or research.

    Use this section to:

    • Introduce kids to the variety of people who work in science
    • Introduce kids to the variety of scientific fields and give brief descriptions of science-related jobs
    • Explore ways that people interact with science every day

    Next Generation Science Standards (NGSS) applications:

    • Science and Engineering Practices
    • Crosscutting Concepts: Influence of Science, Engineering, and Technology on Society and the Natural World

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Many of the scientists and engineers featured in this section are also featured on our collector cards. Learn more about their work, how they got interested in their fields, and interesting projects they worked on. Cards can be printed as posters, too.

    A sample Meet the Scientists page, showing four different scientists
  2. Thinking About Science

    This section briefly describes a concept about science or scientific research. This overview can touch on topics like

    • study type (longitudinal study, quantitative vs. qualitative data),
    • behaviors of scientists (conducting literature reviews, collaborating with other specialists, replicating earlier studies),
    • the practice of science (the scientific method, engineering design, data collection, randomization, controls and variables),
    • or other aspects of science (bias, correlation vs. causation).

    Use this section to:

    • Reinforce steps in the scientific method and the process of science
    • Encourage students to think about the practice of science and what it can and cannot tell us
    • Consider the many types of scientific study and what information each type can provide

    Next Generation Science Standards applications:

    • Science and Engineering Practices
    • Life Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    You can use key words to search for other or related scientific topics on our website (e.g. “longitudinal study,” “bias,” or “sampling”).

    A sample Thinking About Science page from a recent monograph
  3. Thinking About the Environment

    This section provides a brief overview of a topic or concept in environmental/life science. The topic or concept is directly related to the research study that follows. Examples of topics include the carbon cycle, the water cycle, habitat fragmentation, phenology, biodiversity, and ecosystem services.

    Use this section to:

    • Provide important background information to help students understand the research study
    • Serve as a quick reference during reading or class instruction
    • Connect the research article with other activities or media on the same topic

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    You can use key words to search for more resources on life or earth science topics on our website (e.g. “habitat,” “carbon,” or “genetics”).

    A sample "Thinking About the Environment" section from a recent monograph
  4. Introduction

    This section begins the scientific article format. Much like the published, peer-reviewed study this article is based on, the introduction provides background information for the study – what is currently known and what remains unknown. The introduction culminates in the question(s) the study hopes to answer.

    The introduction is also the first section with a Reflection Section. This section includes two or three questions to help kids reflect on what they’ve just learned in the Introduction. If they are using the online distraction-free reading mode, they can answer these questions directly on the website.

    Use this section to:

    • Review important background information that kids need to understand the study
    • Connect the study to the concepts addressed in the Thinking About Science and Thinking About the Environment sections
    • Understand research questions and hypotheses, including generating their own hypotheses given what they already know

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Use one of the guided reading lesson plans to help kids follow the format of a scientific paper.

    A sample introduction page from "Hidden in Plain Sight"
  5. Methods

    This section is the nuts and bolts of the study design – the who, what, when, where, why, and how of the research. Contained within the Methods section are usually maps of the study location or the set-up of study plots, as well as details about what data was collected and how.

    The Methods section also ends with a Reflection Section – two or three questions to help students think through what they just read. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Show students how experiments and studies are designed and carried out
    • Explore sampling methods and randomization
    • Introduce various data collection tools (e.g. camera traps, surveys, insect collection tools, weather stations, etc.)
    • Explain bias and how studies are designed to remove bias
    • Help students gain experience with map reading

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Many Methods and Findings sections contain Number Crunches, which are simple math exercises designed to help students interact with the data from the study.

    A sample methods section of a monograph article showing a map
  6. Findings

    This section summarizes the data collected during the study. The Findings section usually includes data tables or graphs and highlights the significant data points from the study. This section often mentions statistical analysis or the use of computer programs to model or analyze the data, though these methods are only discussed generally.

    The Findings section also ends with a Reflection Section – two or three questions to help students think through what they just read. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Have students practice reading and interpreting graphs and tables
    • Compare results between variables and controls
    • Explain the concept of statistical significance
    • Discuss how no data or negative results still provide valuable information

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Search the website for “map” or “graph” to find activities where students can practice making and reading maps and graphs.

    The beginning of a Findings section featuring a large data table
  7. Discussion

    This section concludes each article. In it, we summarize the main findings of the scientists’ study. Additionally, we present the scientists’ ideas about the limitations of their study, the big-picture impacts of their research, and the scientists’ plans for future study or action.

    The Discussion section ends with a Reflection Section – two or three questions to help students think through what they just read, especially general take-aways from the study. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Discuss what conclusions can and cannot be drawn from the available data
    • Explain the difference between correlation and causation
    • Explore study limitations and opportunities for further study
    • Brainstorm ways the study findings could be applied to real-world situations

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Use the “Designing Your Own Study” resource page for videos of scientists discussing their own research studies. The page also includes educator resources to help students plan their own scientific studies.

    The beginning of the conclusion of "Hidden in Plain Sight"

Additional Resources on the Website

A screenshot of the product tabs for an NI monographOn the website, we pair each journal with a variety of other resources, as well. Use the tabs on the product page to browse through the following:

  • Related activities, including the FACTivity for each article
  • An “About” essay that gives some larger context for the research the scientists conducted or more information about the science topic from the journal
  • A glossary of all boldfaced terms from the journal
  • A “Scientists and Collaborators” page that lists the people involved in the studies in the journal; click on a researcher to reach their bio page and see what other articles they might be featured in
  • A “Related Content” page that lists both Natural Inquirer resources about similar topics and also outside reference materials

Article Selection and Review

Natural Inquirer partners with the USDA Forest Service, so we source research studies by Forest Service scientists that have been peer-reviewed and published in reputable journals. Some of our articles have also been created in collaboration with scientists from other Federal agencies, such as U.S. Geological Survey and the United Nations Food and Agriculture Organization, universities, and other non-profits.

All journal articles are reviewed by scientists who conducted the original research study to verify scientific accuracy. Journals are also reviewed by student editorial review boards of middle or high school students before publication. Additionally, all journals are reviewed by the Forest Service and the U.S. Department of Agriculture before publication.

A screenshot of the citation for "Lights, Camera, Tracks"Every journal article includes a citation of its source study. Many educators pair the original research paper with our article to help more advanced students learn how to read formal research papers. The journal article then serves as adapted primary literature, bridging the two articles.

Lessons

  • PDF preview of Haikus Lesson Plan.
    In this lesson plan, students will complete a guided reading activity while reading their chosen article. As they read, they will complete a double-entry graphic organizer where they will note...

    Lesson Plan – Haikus

    • Lesson Plan
    • Middle School
    • 2-3 Classroom Periods
    • Active Forest Management
    • Agriculture
    • Carbon
    • Citizen Science
    • Engineering and Forest Products
    • Fire
    • Insects
    • Pollinators
    • Pollution
    • Recreation
    • Social Science
    • Water
    • Wilderness
    • Wildlife
    • Creative Writing
    • Graphic Organizer
    • Guided reading
    • Reflection
    In this lesson plan, students will complete a guided reading activity while reading their chosen article. As they read, they will complete a double-entry graphic organizer where they will note...
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)

    Part Of

    Caves and Karst Natural Inquirer - Vol. 20 No. 1

  • PDF Preview of Lesson Plan for Flower Power
    Identify and write the main idea of the section using one sentence. Fill out the provided graphic organizer. This lesson plan can be used with any Natural Inquirer article.

    Lesson Plan – Block Graphic Organizer

    • Lesson Plan
    • High School
    • Middle School
    • 1 Classroom Period
    • Active Forest Management
    • Agriculture
    • Carbon
    • Citizen Science
    • Engineering and Forest Products
    • Fire
    • Insects
    • Pollinators
    • Pollution
    • Recreation
    • Social Science
    • Water
    • Wilderness
    • Wildlife
    • Graphic Organizer
    Identify and write the main idea of the section using one sentence. Fill out the provided graphic organizer. This lesson plan can be used with any Natural Inquirer article.
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)

    Part Of

    Flower Power: Planting for the Past and the Future

  • PDF Preview of the ^-W Questions Lesson Plan
    In this lesson plan, students will read a Natural Inquirer article and write short summary notes from each section. Students will then create “6-W Poems” that reflect their understanding of...

    Lesson Plan – The 6-W Questions

    • Lesson Plan
    • High School
    • Middle School
    • 2-3 Classroom Periods
    • Active Forest Management
    • Agriculture
    • Carbon
    • Citizen Science
    • Engineering and Forest Products
    • Fire
    • Insects
    • Pollinators
    • Pollution
    • Recreation
    • Social Science
    • Water
    • Wilderness
    • Wildlife
    • Graphic Organizer
    • Guided reading
    • Poem
    • Reading Comprehension
    • Writing
    In this lesson plan, students will read a Natural Inquirer article and write short summary notes from each section. Students will then create “6-W Poems” that reflect their understanding of...
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)
    • Explore Lesson Plan
    • Download Lesson Plan (PDF)

    Part Of

    Show Me the Money: Promoting Sustainable Forests in the South

Education Files

Project Learning Tree

If you are a trained Project Learning Tree educator, you may use “Water Wonders” as an additional resource.

Glossary

View All Glossary
  • acidic

    (ə si dik): Acid-forming or like an acid (an acid is a substance with a pH less than 7).

  • asymmetrical

    (ā sə me tri kəl): Having two sides or halves that are not the same.

  • cavity

    (ka vǝ tē): An unfilled space within a mass, especially a hollowed-out space.

  • climate

    (klī mǝt): The average weather conditions of a particular place or region over a period of years.

  • deposit

    (di pä zət): (verb) To let fall (something, such as sediment).

  • discharge

    (dis chärj): (verb) To give outlet or vent to something; to emit.

  • geomorphic

    (jē ə mȯr fik): Relating to the form of the landscape and other natural features of the earth’s surface.

  • gradient

    (grā dē ənt): (1) Slope; upward or downward slant or inclination or degree of slant; (2) a continuous graded change in measure, activity, or substance.

  • morphology

    (mȯr fä lə jē): (1) Structure; (2) Form.

  • precaution

    (pri kȯ shən): A measure taken beforehand to prevent harm or to bring about a good result.

  • sediment

    (se dǝ mǝnt): Material deposited by water, wind, or glaciers.

  • speleothem

    (spē lē ō thǝm): A cave formation formed by groundwater.

  • transect

    (tran(t) sekt): A sample area usually in the form of a long continuous strip.

  • velocity

    (və lä sə tē): Speed of movement.

  • Joel Despain wedged into a rock crevice that is covered in moss

    Joel Despain

    Hydrologist

    My favorite scientific experiences involve understanding the geomorphic history of a given cave or cave area. Some geomorphic questions are, “Why did the cave form, and why did it form...
    View Profile
  • Benjamin Tobin sits in a cave with his back to the camera.

    Benjamin Tobin

    Hydrologist

    Each science experience is amazing, interesting, and fun in its own way. If I had to choose, however, my favorite would be conducting dye traces at the Grand Canyon. This...
    View Profile
  • Greg Stock rappels down the side of a mountain.

    Greg Stock

    Geologist

    My favorite science experience was mapping caves in Sequoia with Mr. Despain. We used those maps, along with dated sediment in the caves, to determine long-term river downcutting rates. The...
    View Profile

Jump To

  • Related from Natural Inquirer
  • Additional Resources

Related Resources from the Natural Inquirer

  • Cover for the 'Under Where?' article. The main image is a photograph of a rocky waterfall.
    When snow melts or rain falls, some of the water runs off into streams or rivers. Most of the water, however, goes down into the soil. The water that stays...

    Under Where? Underground Water and Its Contribution to Streams

    • Article
    • Middle School
    • 1 Classroom Period
    • Water
    • Aquifers
    • Chemistry
    • Ground Water
    • Infiltration
    • Rainfall
    • Snowfall
    • Streamflow
    • Water Cycle
    When snow melts or rain falls, some of the water runs off into streams or rivers. Most of the water, however, goes down into the soil. The water that stays...
    • Explore Article
    • Download Article (PDF)
    • Read Distraction Free
    • Explore Article
    • Download Article (PDF)
    • Read Distraction Free

    Part Of

    Freshwater - Vol. 18 No. 1


Additional Resources

  • National Park Service: Sequoia and Kings Canyon National Parks

    Browse the official National Park Service site for these national parks.

    Visit Website
  • National Park Service: Speleothems

    Learn more about speleothems and how they are formed.

    Visit Website
  • National Speleological Society: A Guide to Responsible Caving

    Read a thorough guide on caving, including tips on safety, conservation, and more.

    Visit Website
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  • USDA
  • USDA Forest Service logo.

The Natural Inquirer program produces a variety of science education materials for PreK through grade 12. Natural Inquirer products are produced by the USDA Forest Service, FIND Outdoors, and other cooperators and partners.

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