Earth

What is the boundary between two air masses called?

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What is the name of a representation of the Earth on a piece of paper?
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What is the repeating cycle of precipitation, condensation and evaporation called?
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Mercurial barometers measure what?
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Yosemite National Park is an easily recognizable part of what batholiths?
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Which word means to "filter down through the soil horizons"?
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What is the organized history of the Earth called?
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Mount St. Helens erupted in what U.S. state?
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What energy does Earth give back to space?
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