from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A fissure on the floor of a sea from which flows mineral-rich water that has been heated by underlying magma, forming a precipitate of minerals and providing an ecosystem for extremophiles.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun a
hot spring, on the floor of the ocean, mostly along the central axesof the mid-ocean ridges, where heated fluids emerge from fissuresin the Earth's crust
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