On a bare, rocky patch of land sits a cone-shaped hump of rock with a hole in its top. Suddenly, with a hiss, a great, silvery spray of steam shoots up out of the hole. A geyser has erupted. Geysers...
Water beneath your feet
All the earth's water isn't in seas, lakes, ponds, and rivers. A lot of it is beneath your feet---down in the ground. When rain falls, much of the water seeps down through the soil. It keeps going...
Holes full of water
A lake is the exact opposite of an island. An island is a piece of land that has water all around it. A lake, or a pond, is water that has land all around it. Some of the places we call seas, such as...
Flood!
> The water is rising! The river is spreading into the streets of the > town! It's a flood! > > Rivers often cause floods because of too much rain or the sudden > melting of lots of ice and snow. A...
Where a river meets the sea
What has its head at one end and its mouth at the other end? A river! The place where a river begins is called its head. And the place where it comes to an end, where it flows into a lake or the...
The story of a river
A river may begin as a trickle of melting snow, high on a mountaintop. It may begin as a trickle of underground water, bubbling out from under a rock on a mountainside. The trickle winds down the...
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...
Where the sea meets the land
Wherever the sea touches land, whether it's the edge of a tiny island or the coast of a continent, there is almost always a beach. A beach is a stretch of sand, pebbles, or mud. The sea makes...
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...
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