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This pair of animated satellite images allows Earth science students to follow the movement of polar and tropical air masses across the United States. The introduction explains how air masses can bring clear weather or precipitation. One animation shows the movement of the polar air mass over the eastern part of the country, and the other follows the movement of the maritime tropical air mass over California. Color is used to indicate precipitation levels. Control buttons allow students to repeat, pause, or step through the animation. Copyright 2005 Eisenhower National Clearinghouse
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