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.
a sea arch is a rock that is shaped into a bridge by crashing water into a sea cave.
they are created by wave erosions.
The features sea stack, sea headland, cliff, sea arch, and sea cave all form from continuous wave erosion over a long period.
By erosion. Sea caves erode to become sea arches which erode to form sea stacks.
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.
earthquake
The plural form for the noun arch is arches.
sea stack
earthquake
A bell arch is an arch of unusual form, following the curve of an ogee.
the sea erodes the rock facing out to sea with corrasion etc this form a cave in the rock this gets bigger until it goes all the way through the rock to the other side - this causes an arch after a while the rock above the arch loses support and the rock left over standing in the sea is a stack when this falls over and gets eroded more, it forms a stump
earthquake
....