Probably no one will ever know for sure why dinosaurs disappeared.  But scientist thin that it was because the dinosaurs couldn’t change to fit themselves to a changing world.

Long ago, when the big dinosaurs roamed the vast swamps that covered much of the land, great changes slowly look place on earth.  Mountains began to appear and the great seaways drained from the continents.

Dinosaur

The warm, swampy land grew dry and chilly.  And the water plants that they are disappeared.

As the plant-eating dinosaurs died out, the meat-eating dinosaurs that depended on them for food also began to disappear.

These changes took place over millions of years.

Everything we know about dinosaurs comes from fossils which are the petrified remains of the dinosaurs’ bones and teeth.

By studying these fossils, scientists can tell what the dinosaurs looked like when they lived on earth.  – Dick Rogers

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