Question

how are jetties and groins similar in how they manage beach erosion? (1 point)
both use beach nourishment to replenish sand on the beach.
both use vegetation to keep sand on the beach.
both are hard structures that keep sand on the beach.
both are soft alternative strategies that use barriers to keep sand on the beach.

Explanation:

• Analyze each option:
• Option 1: Beach nourishment is adding sand, not what jetties/groins do. Eliminate.
• Option 2: Jetties and groins are not vegetation - based. Eliminate.
• Option 3: Jetties (extending into water) and groins (perpendicular to shore) are hard structures built to trap/keep sand on beaches to combat erosion. This matches.
• Option 4: They are hard structures, not soft strategies. Eliminate.

Answer:

C. Both are hard structures that keep sand on the beach.