from The American Heritage® Dictionary of the English Language, 4th Edition
- n. In the theory of plate tectonics, the process by which new oceanic crust is formed by the convective upwelling of magma at mid-ocean ridges, resulting in the continuous lateral displacement of existing oceanic crust.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative form of seafloor spreading.
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