Earth

What substance, added to fog, makes smog?

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Where in Arizona is the sun blocked 10% of the time?
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What is the most-spoken language in the world?
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How old is the earth?
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How many days a year is the sun invisible at the North Pole?
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Which star is the closest one to Earth?
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What branch of science deals with fossils of living things?
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People who inhabit earth are known as...?
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Which of these is not a type of a major oil trap?
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