What Happened to the Dinosaurs?
Dinosaurs
appeared
on Earth about 225
million years
ago. But there are no living
dinosaurs today.
They seem to have become
extinct at
the end of the Cretaceous Period, about 65
million years ago.
It is
quite
possible that the plants they ate died out. Or maybe a comet or meteorite hit the
Earth,
causing an explosion that threw clouds of
dust
into the atmosphere. The dust blotted out the Sun, plants died and so did the
dinosaurs.
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