D. VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY D. VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Dinosaur extinction. Artwork of the death of the dinosaurs after the Earth was struck by a comet or asteroid 65 million years ago. A Triceratops dinosaur skull lies in a landscape which has been burnt by the blast of the impact. Dark clouds of smoke and dust fill the sky, blocking the light & warmth of the Sun and providing a source for acid rain. The comet or asteroid struck the Earth at Chicxulub on the Yucatan peninsula, Mexico. This event, which may have caused the extinction of the dinosaurs and 70% of all species on Earth, is known as the "K/T impact" because debris from it forms a boundary in sediments between the Cretaceous (K) and Tertiary (T) geological periods.
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