America was once the center of the world, being that it was at the center of Pangea. New York, United States of America, tends to think of it's city as the center of the world, and during the course of geological history, this was once true. Before Pangea formed, amphibians were the dominant animals on Earth. Sand comes apart after 33 - 34 degrees of an angle occurs, which means that sand dunes are constantly shifting because of wind, but also because of gravity, which is rarely considered to be...
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