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The highest point of an arch is called the "keystone." It is the central stone at the apex of the arch that locks all the other stones in place, allowing the structure to bear weight and maintain its shape. The keystone is crucial for the stability of the arch, distributing the forces evenly down to the supports.
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Headland,Sea Cave, Sea Arch, Sea stack,and wave-cut cliff. EXAMPLE WITH SEA ARCH AND SEA STACK: A sea arch is formed when two caves on opposite sides of a headland join. The sea arch collapses when the waves & weathered sediment (rock particles),hit it continuously in which a sea stack is formed. the sea arch is then .eroded and deposited in a new place.
A sea arch is an opening that was made naturally by the ocean by the sea water eroding the rock. Sea arches can also be formed by wind, or by the land. Or they can also be combination of all three. A sea arch is an arch that is made from an eroded cliff face. The water makes the sea arch after many years.
A sea cave that wears through a cliff is called an arch.
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sea stack
A sea arch is formed by erosion, not deposition. It is created by the continuous action of waves eroding the rock from both sides of a headland, eventually forming an arch.
straight from junior cert geography book: A sea arch is a natural archway in a rocky headland. If a cave erodes rights through a headland (or if two caves erode through from either side), an arch may form.