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provides animations, images, graphs, and photos on the carbon cycle, greenhouse gases, sea ice, sea level change, interglacial cycle, continental drift, tectonic cycle, and the hydrologic cycle. (Carleton College, National Science Foundation)
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While many people throughout history have reflected on the mobile nature of the earth's surface, one of the first scientists to put forward a well-documented proposal for the large-scale motion of continents was a German meteorologist named Alfred Wegener. He compiled various lines of evidence supporting the hypothesis that all of earth's continents had been assembled as a single "supercontinent" approximately 250 million years ago. |
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The carbon cycle |
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