Earth

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

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When does magma become lava?
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Advection, freezing and radiation are types of what weather phenomenon?
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A 286-mph tornado ripped through what U.S. state?
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What are rocks made from?
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What is the name for a 100 foot tall tidal wave?
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What are ridges of rock debris caused by glacial action called?
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What is the measure of the moisture level of air called?
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In weather, "mean" means what?
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