Earth

What is an underwater boat with its own power and air supply called?

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What is a seven-letter word meaning "movement of weathered material from gravity"?
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What is a diamond an example of?
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What layer of the Earth's atmosphere contains the ozone layer?
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What is the name of the fossil resin that is often used in jewelry making?
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A 17.5-inch hailstone was recorded in what U.S. state?
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What is the common name for the Cenozoic Era?
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In a "drought", what is absent in terms of weather?
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What is the destruction of forests called?
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