We think of birds as creatures of the air. So it's always a little surprising to learn that some birds can't fly. But have you ever heard of a bird that can swim like a fish and stay underwater for...
Learning about the sea
An oceanographer uses a device called a sonar to locate underwater sounds. Behind her is the underwater house she stays in. How long can you hold your breath under water? A few seconds? A minute?...
Why the sea is salty
You could be out in the middle of the ocean---surrounded by thousands of miles (kilometers) of water---and not have a drop of water you could drink. For seawater is full of salt. If you did drink it,...
Where the sea pokes into the land
A bay is a place where a tiny bit of the sea, or a lake, pokes into the land. Seen from an airplane, a bay often looks as if a giant had taken a big bite out of the edge of the land and water had...
Floating mountains of ice
> an iceberg near Antarctica What is that great, shining shape floating in the cold, gray water of the northern sea? Is it a mountain of snow? Is it an island of ice where the Frost Giants live? Is...
High tide, low tide
It is early in the misty morning. You are standing on a cliff that overlooks the sea. Gulls soar overhead, calling to one another with shrill cries. Below you, the gray sea crashes against the shore....
The bounding waves
> Stand at the seashore, or a lakeside, on a windy day. Watch the waves > as they rush in toward you. They seem to come rolling at you as if > pushed by a giant hand. With a great hiss and a swirl 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....
Stone icicles
Many a cave is filled with what look like giant stone icicles. Some of these "icicles" hang down from the cave's roof. Others stick up from the floor. They are often as thick as tree trunks....
Holes in rock
A den for bears and a bedroom for bats. A home for prehistoric people. A dark place of gloom and mystery. A sparkling wonderland of strangely shaped rocks. That's a cave! A cave is simply a hole in...
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