[grah-buh n] /ˈgrɑ bən/

a portion of the earth’s crust, bounded on at least two sides by faults, that has dropped downward in relation to adjacent portions.
an elongated trough of land produced by subsidence of the earth’s crust between two faults
A usually elongated block of rock that is bounded by parallel geologic faults along its two longest sides, and has a lower elevation than the rock at its sides. Grabens form where rock is being pulled apart by tectonic forces. The East African Rift Valley is a graben.


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