![Sunlight plays off the Canada Glacier in the Wright Valley, one of the McMurdo Dry Valleys. Credit: Peter Doran, National Science Foundation](https://webarchive.library.unt.edu/eot2008/20090116064706im_/http://www.free.ed.gov/images/resources/06113.jpg)
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Arctic and Antarctic looks at research being conducted in the two polar regions of earth. These vast, icy...
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![Southern Ocean map of the Antarctic region](https://webarchive.library.unt.edu/eot2008/20090116064706im_/http://www.free.ed.gov/images/resources/usap.jpg)
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U.S. Antarctic Program aims to understand the world's coldest, windiest, driest, and harshest continent -- its...
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![Image of the Holy See, St. Peter's Square](https://webarchive.library.unt.edu/eot2008/20090116064706im_/http://www.free.ed.gov/images/resources/portals.jpg)
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Portals to the World is a starting point for studying other countries and parts of the world. Learn about the...
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![During a total solar eclipse, the umbra reaches the Earth. During an annular eclipse, it does not. An eclipse occurs when the Moon passes in the path of the Sun and Earth.](https://webarchive.library.unt.edu/eot2008/20090116064706im_/http://www.free.ed.gov/images/resources/windows.jpg)
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