Earth
What was the name of the volcano that used to be Crater Lake?
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How was the 12-mile limit of a country's boundary set?
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About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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What type of scientist studies microscopic plants and animals?
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What is a meteoroid called if it lands on the Earth's surface?
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Which volcano in Iceland was once thought to be a gateway to the underworld?
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