Earth
What family are both poison oak and poison ivy part of?
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78% of the earth's atmosphere is composed of which gas?
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What type of power did the ancient Persians use to grind grains?
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What is water treated with to prevent bacteria from growing?
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What chamber do divers go into to prevent a diving sickness called "the bends"?
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On October 11, 1999 the world population hit a milestone of how many?
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What are the broken-off pieces of glaciers that make it to the open sea called?
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What is a scientist who specializes in soil and crops called?
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