Earth
What is another name for permanently frozen ground?
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What word is generally used to describe visible air pollution?
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What clouds have bases between 6,000 and 18,000 feet?
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What is the transport of top layers of soil to another place called?
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What is the cooler air rushing down a mountainside called?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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According to the International Flat Earth Society, where is the hub of the world?
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