Earth
What happens to the air pressure as we increase our altitude?
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What happens to the air pressure as we increase our altitude?
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If an organic material is converted into stone, it becomes what?
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On October 11, 1999 the world population hit a milestone of how many?
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What organic material is formed from decaying organisms that mix with rocks?
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Approximately what fraction of the Earth's air is made up of oxygen?
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What type of power did the ancient Persians use to grind grains?
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