Coastal Defence Exercise

Match the description with the type of coastal defence. Note: this exercise is scored on a system that deducts points for incorrect answers from your final score.

Sand and pebbles are dredged from the sea bed and added to existing beaches.
Wooden barriers which extend into the sea are built across the beach.
Large boulders are placed at the base of cliffs to prevent erosion.
Concrete barriers are built at the back of the beach.
Cobbles and pebbles are wired together in a steel mesh.
Steep slopes are drained and terraced.