Long linear limestone masses composed of skeletal material and forming a barrier between a shallow platform on one side and a comparatively deep marine basin on the other side are ____.

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Long linear limestone masses composed of skeletal material and forming a barrier between a shallow platform and a comparatively deep marine basin are known as barrier reefs. Barrier islands are elongated deposits of sand or sediment parallel to the coast, while ophiolites are portions of the Earth's oceanic crust and upper mantle that have been uplifted and exposed above sea level. Beaches are deposits of sand or other sediment along a coastline, and alluvial fans refer to deposits of sediment at the base of a mountain range or other steep slope.

Long Linear Limestone Masses Composed of Skeletal Material and Forming