Discussion
The place where material is excavated when the zone of maximum stream velocity approaches the stream's bed is called
Answer: A
Where the zone of maximum stream velocity swings down towards the bed, the extra energy scours the channel and excavates a deep scoured pool.
Between the pools the velocity core lies higher in the flow, so material is deposited instead, building the shallow gravel bars called riffles. Pools and riffles therefore alternate along a channel.
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