Earth

What substance, added to fog, makes smog?

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What type of rock is coal?
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What is another name for the "Humboldt Current"?
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The definition of "subjective term for warm and excessively humid weather" best fits which science term?
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What is compressed moss that turns blackish brown called?
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What disaster is a combo of downdrafts and updrafts?
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How old is the earth?
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What word means a mild or moderate temperature?
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What is the system consisting of the Earth's sun and the eight planets orbiting it called?
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