Earth

What is the opening that spews out lava called?

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What word is generally used to describe visible air pollution?
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What are solids contained in the gas that issues from a volcano called?
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Which one of these is most alkali?
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What is the tendency of Earth's rotation to turn winds called?
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What is mining near the Earth's surface called?
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Where is the type location for the Permian Period?
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Cumulus and stratus are types of what?
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How many continents does Earth have?
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