No reptile that lives today---snake, turtle, lizard, alligator, or crocodile---can fly. And no reptile of today has hair on its body. But scientists say that 150 million years ago there were many...
Turtles and terrible lizards
According to most scientists, the first dinosaurs came into the world about 225 million years ago. And along with them came the first turtles. The word dinosaur means terrible lizard. But the first...
A 250-million-year-old puzzle
Scientists tell us that about 250 million years ago there lived a big reptile called Dimetrodon. It was about as long as a small automobile. It ate smaller reptiles. Dimetrodon had a big fin like a...
Volcano watchers
The ground shakes and quivers. Deep in the earth there is a roaring rumble. Suddenly, there is a giant explosion! A cloud of steam, mixed with dust and chunks of rocks, shoots out of the top of the...
Cave scientists
Watch your head---there's a stalactite! Oops, don't trip over the stalagmite! Where are you? In a cave! Scientists who study caves are called speleologists. Most caves are dark, slippery tunnels of...
Where did the ocean come from?
Scientists tell us that billions of years ago the earth was a ball of bare, sizzling-hot rock, with no air or water on it. The outside of the earth slowly cooled, but the inside stayed fiercely hot....
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