Earth
Thunderstorms form on what "lines"?
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In weather terms, what turns to water in a "spring thaw"?
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What type of fossils give only evidence of activities of past living creatures?
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What is another name for permanently frozen ground?
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If an organic material is converted into stone, it becomes what?
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What kind of scientist would study rocks, minerals and mountains?
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Whose concept of erosion cycle dominated geology for 50 years after its release?
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What is the test that can help determine the hardness of a rock called?
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What molecules in fossil fuels are made from carbon and hydrogen?
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