Science

What protects our Earth from harmful rays?

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What is the perception of frequency called?
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What is water stored beneath the surface of the Earth called?
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In math, "pi" is equal to?
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The four engines of a Boeing 747 jet produce 188,000 pounds (85,275 kilograms) of what?
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What planet in our solar system has the most liquid water on its surface?
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What term describes what happens when ice breaks off a main glacier and becomes an iceberg?
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What describes an extremely dry climate?
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What blood vessels take blood away from the heart?
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