Discussion

Match the following :

Answer: C

The correct match is a-3, b-4, c-1, d-2.

Pools alternate with riffles along a stream channel: deep, slow stretches with shallow, fast ones (a-3).
Sapping is erosion by groundwater seeping out at the base of a slope, which undermines it and lengthens the valley headward (b-4).
A barrier spit encloses a lagoon behind it (c-1).
A stack is left standing off a headland when an arch collapses (d-2).

The other codes pair pools with lagoons or headlands and sapping with riffles, which do not belong together.

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