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thermal vent

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An opening in the Earth, especially on the ocean floor, that emits hot water and dissolved minerals. See more at hydrothermal vent.
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ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
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Which of the following words describes “sky blue”?
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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