What Causes an Earthquake?
What Causes an Earthquake? An earthquake is caused by movements that take place beneath the Earth’s surface. The outer layer (crust) of the Earth consists of huge...
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How Fast Can Winds Blow?
How Fast Can Winds Blow? In the United States, most winds average eight or twelve miles an hour near the ground. At this speed, papers blow along the ground and leaves...
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How Are Hailstones Formed?
How Are Hailstones Formed? Hailstones are balls of ice that fall from storm clouds. Hail is a type of precipitation, or water in the atmosphere. Hail starts out as...
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Why Do Tennis Balls Bounce?
Why Do Tennis Balls Bounce? Like many other types of balls, tennis balls have a hollow center filled with air. Like all gases, the air inside a ball moves around easily...
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How Did Planet Earth Get Its Name?
The planet Earth get its name from the old English word earth. Before people realized that the Earth is a planet, our word, “earth,” simply meant the ground...
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