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Geography

Which mechanism causes formation of elongated grabens adjacent to strike-slip boundaries?

A)Shear-induced brittle fracturing
B)Isostatic rebound after unloading
C)Mantle plume upwelling uplift
D)Sediment loading flexural subsidence

💡 Explanation

When stress accumulates along strike-slip faults, shear-induced brittle fracturing occurs because lateral movement concentrates stress, causing extensional cracks and the formation of grabens through thinning of the lithosphere. Therefore graben formation results, rather than rebound, upwelling uplift, or subsidence which require different geological conditions.

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