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What caused the end of the dinosaurs?

Dead and dying dinosaurs at the end of the CretaceousAt the end of the Cretaceous Period, 66 million years ago, all the dinosaurs suddenly died out. It was not only the dinosaurs that became extinct: pterosaurs, marine reptiles and a number of other marine creatures also disappeared forever. The Earth may have become a bleak, cold desert for a time, a world where only a few kinds of animals could survive.

An asteroid hurtles towards Earth 66 million years ago

Asteroid crash

Most scientists think that a giant asteroid, a large rocky object in space, which crashed to Earth at this time was the culprit. Millions of tonnes of rock and dust would have been thrown up high into the sky by the colossal explosion. This would have blotted out the sun and changed the climate for many years. The Earth would have become a frozen world.
Dinosaurs watch the explosion in the distance

The dinosaurs perish

Around two-thirds of all kinds of animal on Earth were wiped out during the extinctions at the end of the Cretaceous Period.

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