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Asteroids and dinosaurs: Unexpected twists and an unfinished story Walter Alvarez, an American geologist, was working with other scientists to look for certain rock patterns that would help to explain part of Earth’s h
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Document Date: 2009-12-15 19:07:40
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Asteroids and dinosaurs: Unexpected twists and an unfinished story Walter Alvarez, an American geologist, was working with other scientists to look for certain rock patterns that would help to explain part of Earth’s h