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Receding Ice Cover
See an animation showing over time, the receding of summer sea ice in the Arctic.
Fri, 01/07/2011 - 11:26
You may have seen the sparkle of fireflies on a summer’s night. The fireflies...
Microscopic, single-celled organisms called foraminifera have a fossil record that...
Thu, 03/25/2010 - 16:23