Earth

What is water treated with to prevent bacteria from growing?

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What is the mountain range that separates Spain from France?
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What chamber do divers go into to prevent a diving sickness called "the bends"?
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About 100 lightning bolts strike the earth how often?
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A clear sky contains very few what?
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What process helps to break down rocks by wind, air or rain?
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What type of rock is coal?
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What must happen for a tree to become a fossil?
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What is the most common element in Earth's atmosphere?
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