Earth

What fuel comes from the remains of 300-million-year-old decayed fern plants?

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What word means a mild or moderate temperature?
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Earth is located in which galaxy?
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Which is heavier, cold air or warm air?
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What evidence tells scientists that some dinosaurs may have lived together in groups?
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What is a scientist who specializes in soil and crops called?
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What are rocks made from?
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What is the name of the submerged fringe of a continent?
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What did ancient farmers probably use to tell the passing of seasons?
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