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.
Sea Arches are arches over the sea that are formed by waves eroding into sea caves until there is a hole in the headland.
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.
earthquake
sea stack
earthquake
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.
earthquake
....
Earthquakes
By erosion. Sea caves erode to become sea arches which erode to form sea stacks.
a cliff.
a sea stack
The features sea stack, sea headland, cliff, sea arch, and sea cave all form from continuous wave erosion over a long period.