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American Geosciences Institute
American Geosciences Institute: Earth Science Week: Earth's Hydrologic Cycle
In this experiment, learners create a model of the water cycle and learn about its crucial role in moving water around the Earth.
US Geological Survey
U.s. Geological Survey: Where Is Earth's Water Located?
Find out how much of the water on Earth is actually usable by humans, and where the rest of it is located. Learn where our water comes from and why it never runs out. Click Home to access the site in Spanish.