Definitions

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 graben structure between two tectonic plates which are opening relative to each other.
  • noun geology A mid-oceanic ridge system with central valleys.

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