Definition of "grabens" []

• Plural form of graben. (noun)

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• "Stretching out across an area about equal in size to the state of California, the Sea of Fertility's western edge is home to features we share terrestrially – grabens."
• "Like all maria, it is part of a gigantic basin which is filled with lava, and there is evidence of grabens along the western edge of the basin."
• "All three valleys are faultbounded grabens or depressions filled with sediments."