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← GeographyWhich process drives the formation of layered sedimentation within an alluvial terrace?
A)Isostatic rebound from glacial retreat
B)Cyclical avulsion due to base-level change✓
C)Tectonic uplift combined with weathering
D)Thermal expansion exceeding rock strength
💡 Explanation
When base level drops cyclically (sea level or a lake level falls) avulsion causes channels to shift and deposit sediment in layers on the floodplain terrace, modifying alluvial terrace topography. Therefore cyclic avulsion results, rather than rebound, uplift-weathering, or thermal expansion which generate different geomorphic features.
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