Why are dinosaurs buried so deep? Did rock form over them?
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As a small factor, there is also material our planet picks up from space. Estimates are that we acquire about 5200 tons of space dust per year. Multiply that by 65 million years, and that adds roughly 338 billion tons of dust. Reality is, that’s probably less than an inch or two over the whole earth, but it still adds to the erosion materials.
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