Humans build walls perpendicular to the shoreline called

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Groins are walls that are built perpendicular to the shoreline to trap sand and prevent erosion. Spits are long narrow ridges of sand that extend from the shore into the water. Baymouth bars are sandbars that form at the entrance to a bay or harbor. Berms are ridges of sand and sediment that run parallel to the shoreline. Out of these options, groins are the only structures that fit the description of a wall built perpendicular to the shoreline.

Humans Build Walls Perpendicular to the Shoreline Called