What Is Clay?
Clay is a special kind of earth. It is made up of the smallest particles of rock, tinier than those in most other kinds of soil. The minerals that make up ordinary clay...
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Why Don’t Fish Sink?
Why Don’t Fish Sink? Fish have adapted to life in water. They are able to move in water, of course. Their body density is slightly smaller than the water in which they...
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How Does a Clam Make Its Shell?
If you have ever examined a clam shell, you may have wondered how the shell got bigger as the clam grew. A clam is born with a shell just the right size for its body....
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How Many Oceans Are There in the World?
How Many Oceans Are There in the World? The world’s ocean is composed of four main bodies of water. If you have ever tried to locate the “seven seas” on a...
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Why Does a Glass Crack When Hot Water Is Poured into It?
Why Does a Glass Crack When Hot Water Is Poured into It? An ordinary drinking glass may crack if you pour hot water into it. Glass expands, or swells, when it is made...
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