Earth

What is another name for permanently frozen ground?

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Which unit measures atmospheric pressure?
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What percentage of the earth's water is drinkable?
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Hot, hazy weather mixed with pollution leads to what?
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What direction does a compass needle point to?
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Which of these is a spiral storm that can be many miles wide?
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What natural disaster is caused by earthquakes but could also be caused by an asteroid?
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What are solids contained in the gas that issues from a volcano called?
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What ongoing process allows water to be constantly recycled?
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