Earth

What substance, added to fog, makes smog?

More Questions from Earth
What instrument do you use to measure wind speed?
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In what month does a "Milk Moon" occur?
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What does your body use to get rid of salt?
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What is a plant with no internal system of tube like structures called?
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Which word means to "filter down through the soil horizons"?
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What is the hottest place on earth?
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Which of the following lakes has a higher salt content than normal?
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In which country is Fiordland, which contains the Milford Sound fiord, located?
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