1) Waves can erode a) sand. b) rocks. 2) Some waves are large enough to a) crumble. b) surf. 3) Erosion can cause problems for a) houses. b) sand castles. 4) Most cliffs are a) natural. b) man made. 5) Most sea walls are a) man made. b) natural. 6) Sea water is a) harder than rock. b) softer than rock.

Intermediate 2, Unit 09

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