Which coastal feature is the depression that lies between the shore and offshore longshore bars?

Which coastal feature is the depression that lies between the shore and offshore longshore bars?

• A. Lagoon
• B. Inlet
• C. Moraine
• D. Longshore Trough

Answer: (D)

Sediment being moved by waves along the coast builds offshore ridges called longshore bars. The space between the shoreline and these offshore bars forms a low, elongated depression—the longshore trough. This trough results from the action of longshore currents and wave energy scouring the seabed between the shore and the bars, creating a distinct trough-like feature. Other options don’t fit this description: a lagoon is water behind a barrier that’s often enclosed from the open sea; an inlet is a channel that connects a lagoon to the sea; and a moraine is a glacially formed accumulation of rock and soil.

Sediment being moved by waves along the coast builds offshore ridges called longshore bars. The space between the shoreline and these offshore bars forms a low, elongated depression—the longshore trough. This trough results from the action of longshore currents and wave energy scouring the seabed between the shore and the bars, creating a distinct trough-like feature.

Other options don’t fit this description: a lagoon is water behind a barrier that’s often enclosed from the open sea; an inlet is a channel that connects a lagoon to the sea; and a moraine is a glacially formed accumulation of rock and soil.