Wave-cut platform, also calledAbrasion Platform, gently sloping rock ledge that extends from the high-tide level at the steep-cliff base to below the low-tide level. It develops as a result ofwave abrasion; beaches protect the shore from abrasion and therefore prevent the formation of platforms. A platform is broadened as waves erode a notch at the base of the seacliff , which causes overhanging rock to fall. As the sea cliffs are attacked, weak rocks are quickly eroded, leaving the more resistant rocks as protrusions. These irregularities may take the form of sea arches, sea stacks, or sea caves.