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This series of three Earth science animations shows middle and high school students how cyclical changes in the Earth's orbit and the tilt of its axis contribute to climate changes. The animations demonstrate how changes in precession, eccentricity, and obliquity cause differences in the amounts of sunlight received by the Northern and Southern Hemispheres. Each animation is accompanied by explanatory text. Movie controls allow students to repeat, pause, or step through the animation, which can give students more time to read the text and connect it with the images. Copyright 2005 Eisenhower National Clearinghouse
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