Why Is Ice Slippery?
It is hard to walk on ice because its smooth, frozen surface causes you to slip. Ice is slippery not only because it is smooth but also because it melts under the...
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How Is Coal Formed?
How Is Coal Formed? Coal comes from plants that have been buried in the earth so long, they turned hard and black. Millions of years ago, much of the earth was swampy...
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What Makes Geysers?
Geysers are steam explosions of a spring from which water and steam is ejected forcefully into the air at heights ranging from less than a few feet to over several...
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How Are Diamonds Formed?
You may know that diamonds are crystals formed almost entirely of carbon. Natural diamonds are formed in dying volcanoes, where great heat and pressure act on the...
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Where Do Volcanoes Begin?
Where Do Volcanoes Begin? Volcanoes begin deep inside the earth. The earth’s crust is made up of giant pieces of rock called plates. Volcanoes are located where...
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