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← GeographyWhich mechanism initiates the formation of rift valleys along divergent continental plate boundaries?
A)Compressional stress causing crustal folding
B)Tensional stress causing normal faulting✓
C)Shear stress causing strike-slip faulting
D)Hydrothermal alteration weakening rock strength
💡 Explanation
When continental plates diverge, tensional stress increases causing crustal extension because lithospheric thinning occurs, resulting in normal faulting and subsidence. Therefore rift valley formation results, rather than folding, strike-slip faulting or hydrothermal alteration which require different stress regimes.
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