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Geography

Which mechanism causes increased stream meandering in regions experiencing permafrost thaw?

A)Decreased sediment load and grain size
B)Increased bank erodibility and runoff
C)Enhanced vegetation stabilization and infiltration
D)Reduced channel slope and flow velocity

💡 Explanation

When permafrost thaws, soil cohesion decreases because ice melts which weakens soil structure, resulting in higher bank erosion. Therefore, bank erodibility and runoff increase leading to meandering, rather than decreased sediment, vegetation stabilization, or reduced slope which would have the opposite effect.

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