Earth
What is the boundary between two air masses called?
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What is the hard, dark substance found in the ground that is mined for fuel?
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What polluting material can choke an animal by getting caught around its neck?
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The coldest recorded temperature on Earth, -128 degrees F., was taken where?
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What are the traces of animals and plants left in rocks called?
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On October 11, 1999 the world population hit a milestone of how many?
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Sudden flooding caused by heavy rain is called what?
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