Earth

What is the boundary between two air masses called?

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Which of these habitats describes the North Pole?
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How cold does it need to be outside before it can snow?
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What is the name for huge waves that are often caused by an underwater earthquake?
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Mercurial barometers measure what?
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What was the name of the volcano that used to be Crater Lake?
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What is the length, in miles, of the San Andreas Fault?
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Which of these is not a metamorphic rock?
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What is another name for fossilized resin?
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