Earth
What type of fossils give only evidence of activities of past living creatures?
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What was the name of the volcano that used to be Crater Lake?
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What weather-related term comes from Greek words for "high in the sky" and "knowledge"?
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What is the name of the limestone formation that rises from a cave floor?
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What organic material is formed from decaying organisms that mix with rocks?
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What layer in the atmosphere is responsible for filtering out solar radiation?
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What color was the dust that swept the Great Plains?
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Snow particles that have blown into a pile are said to form what?
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In the United States, summer officially begins in which month?
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