Q: What is a wall of rocks or concrete called?


Read this paragraph and choose the correct option from the provided answers:

Longshore drift can erode the sediment from a beach. To keep this from happening, people may build a series of groins. A groin ( Figure below ) is wall of rocks or concrete. The structure juts out into the ocean perpendicular to the shore. A groin stops the longshore movement of sand. Sand collects on the up-current side of the groin. Sand on opposite of side of the groin erodes. This reduces beach erosion.

 Choices:

- knee

- ankle

- foot

- groin


A:
groin