from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A series of mountain ranges on the ocean floor, more than 84,000 kilometers (52,000 miles) in length, extending through the North and South Atlantic, the Indian Ocean, and the South Pacific. According to the plate tectonics theory, volcanic rock is added to the sea floor as the mid-ocean ridge spreads apart.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a mid-oceanic ridge
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