from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A valley that has developed along a rift, especially one bounded by normal faults.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology A
grabenstructure between two tectonic plateswhich are opening relative to each other.
- noun geology A mid-oceanic
ridgesystem with central valleys.
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