![Image of the United States with longitude and latitude lines.](https://webarchive.library.unt.edu/web/20090807173117im_/http://www.free.ed.gov/images/resources/0549.jpg)
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Nationalatlas.gov is a primary source of U.S. maps and geographic information. Zoom in on your state and...
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![Early Cretaceous period (120 Ma)](https://webarchive.library.unt.edu/web/20090807173117im_/http://www.free.ed.gov/images/resources/0648.jpg)
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Teach the Earth offers hundreds of teaching activities, visualizations, and resources for teaching earth...
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![Black and white diagram illustrating processes in the water cycle.](https://webarchive.library.unt.edu/web/20090807173117im_/http://www.free.ed.gov/images/resources/05115.jpg)
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![Rivers of molten rock leave a lava tube and flow seaward across a young outcropping of land at the Ka`ili`ili entry on Kilauea volcano in Hawaii on Feb. 20, 2005.](https://webarchive.library.unt.edu/web/20090807173117im_/http://www.free.ed.gov/images/resources/06115.jpg)
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Disasters looks at research that helps anticipate disasters and minimize their effects. Learn about...
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