Earth

What substance, added to fog, makes smog?

More Questions from Earth
How many miles long is an average bolt of lightning?
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What winds in California are responsible for forest fires during the winter?
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What is the theory that describes how the continents got where they are today?
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Whose concept of erosion cycle dominated geology for 50 years after its release?
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Which of these is not a type of a major oil trap?
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What bodies of water cover almost 70% of the Earth?
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What is the origin of dinoflagellates?
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What is the only continent on Earth that does not have snakes?
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