Which coastal feature serves as a protective barrier extending into the sea to reduce wave energy at harbors?

• A. Coast
• B. Breakwater
• C. Berm Crest
• D. Coral Reef

Answer: (B)

The main idea here is how a barrier placed into the sea can calm waves to protect a harbor. A breakwater is built to extend out into the water and act as a barrier that absorbs or deflects wave energy. By disrupting the waves before they reach the harbor, it creates a sheltered area behind it with much calmer water, making docking and anchoring safer and reducing erosion at the harbor entrance. While natural features like coral reefs can also dissipate wave energy, the term that specifically describes an artificial barrier extending into the sea to protect harbors is breakwater. The other options don’t fit because the coast is just the shoreline, a berm crest is part of a beach profile, and coral reefs, though they reduce energy, aren’t the engineered barrier meant to shield harbors.