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Geography

Which mechanism drives the uplift of large crustal blocks adjacent to normal faults in rift valleys?

A)Isostatic rebound due to erosion
B)Fault block rotation along curved faults
C)Thermal expansion from magma intrusion
D)Sediment loading in valley basins

💡 Explanation

When normal faults form in rift valleys, fault block rotation occurs because curved faults create differential displacement, causing uplift on one side and subsidence on the other. Therefore, block rotation causes uplift, rather than isostatic rebound, thermal expansion, or sediment loading which involves different processes.

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