At Gooseneck State Park in Utah, the San Juan River winds through deep canyons it has cut into layers of sedimentary rocks.
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How old are the rocks where you live?
Use the Internet or your local library to learn about a river system in your area. Search for information on the topography, climate, and history of the watershed. Using images from online mapping sites and photo sharing sites, create a narrated slide show that gives a virtual tour of the watershed's features. Post your slide show to a class blog and collect feedback from classmates and other residents in your area.
How do science concepts apply to your world? Here are some questions you'll be able to answer after you read this chapter.
Where is most of Earth's fresh water found? (Section 23.1)
What are hoodoos, and how are they formed? (Section 23.2)
How is a river like a dump truck? (Section 23.3)
When was the Chicago region covered by a sheet of ice more than a kilometer thick? (Section 23.4)
How would Earth's surface look if the oceans were drained? (Section 23.5)
How do scientists explore the ocean floor? (page 730)
How can scientists determine the age of a fossil or a rock? (Section 23.6)