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When were dinasours extinct?
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Scientists believe that an asteroid six to 12 miles in diameter hit an area in Chicxulub, Yucatan Peninsula, Mexico approximately 64.98 million years ago. This asteroid impact threw up billions of tons of dust into the atmosphere and blocked out the sunlight for almost half of a year, dropping the temperatures down to freezing. This killed most of the vegetation and half of the species living on the Earth at the time, including all of the large dinosaurs. This coincided with the fossilized remains showing that fossils of large dinosaurs stopped occuring in the timeline of the rock approximately 65 million years ago. See the related link for more information.

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