Earth

What is another name for permanently frozen ground?

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Which pairs of minerals are almost always found together?
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What breaks when its height is 3/4 of its depth?
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From what perspective does a map shows what the earth looks like?
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Lightning struck what eight times in 24 minutes?
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What happens to the pressure of water as depth under the water increases?
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Which body part is also a name for the center of a hurricane?
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Who published the groundbreaking book "Principles of Geology" in 1830?
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People who inhabit earth are known as...?
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