Which mechanism amplifies stream channel incision when tectonic uplift interacts with variable bedrock resistance?

💡 Explanation

When tectonic uplift increases stream gradient, differential erosion results because hydraulic action preferentially erodes weaker bedrock layers exposed along the stream bed, leading to accelerated channel incision where resistance varies. Therefore differential erosion amplifies incision, rather than sediment transport, chemical weathering or glacial plucking, as those have lower immediate impact.

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