Earth

What substance, added to fog, makes smog?

More Questions from Earth
What type of speleothems found in limestone caves grow upward from the floor?
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What zone is between the Earth and the atmosphere?
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Where is the coldest place on earth?
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What cloud has a flat, sheetlike appearance?
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What is the area on one side of a mountain that receives little rain called?
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What is the federal weather agency in Canada called?
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What does Earth do to cause night and day?
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Mercurial barometers measure what?
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