Earth

What is the opening that spews out lava called?

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In weather terms, what is the opposite of heat?
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On which canal would a traveler find Port Said?
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Which body part is also a name for the center of a hurricane?
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How many continents does Earth have?
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What does a pluviometer measure?
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What is the area filled with groundwater called?
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Which of these pairs of elements was discovered before the 14th century?
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What is the calm center part of a hurricane called?
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