Earth

What is the boundary between two air masses called?

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What type of satellites are always in the same spot in Earth's orbit?
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In the U.S., the spring equinox occurs in what month?
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What term describes warm and excessively humid weather?
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What is another name for layers of rock?
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What does your body use to get rid of salt?
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What is the name given to a fossil that best defines a rock layer's age?
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What reef is the largest living structure on Earth?
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