Earth

What substance, added to fog, makes smog?

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Which material do fossils make more attractive to an architect?
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What word means to degrade naturally?
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What is the coldest, windiest and driest place on Earth?
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About 100 lightning bolts strike the earth how often?
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What kind of waves does an earthquake produce?
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Which is the parent rock of marble?
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To which island group do Kwajalein and Eniwetok belong?
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Which of these bodies of water would it be easiest to float and swim in?
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