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The magician lifted up his magic curtain, and in a flash, the dinosaurs were gone. The question posed by such a magic trick is how did an entire species vanish in such a short time? Scientists have been trying to solve this puzzling mystery by looking at the geological record, which is a timeline created through the close study of fossils. These fossils have given scientists three main theories of what led to the extinction of the dinosaurs: marine regression, volcanism, and asteroid impact. These theories either occurred during or before the Cretaceous-Tertiary boundary or KT boundary, which is the space between time periods relative to the geological record. While these theories are highly speculative due to the lack of concrete facts and contradicting evidence, it will be shown that asteroid impact is most likely responsible for wiping out the gigantic creatures whose bones are the sole remnants of their existence. Marine regression occurred when the main seas on Earth started to drain. It is believed to have begun before the KT period. Estimates of marine regression state that about eleven and a fifth million square miles of land were exposed from the draining of the oceans. This massive land addition to the environ