It is a geological land form consisting of a steep & often vertical column / columns of rocks in the sea near coast.
Stacks are formed when a part of a headland is eroded leaving small island. They are also form when natural arch collapses due to sub-aerial processes & gravity.
A stack may collapse / be eroded leaving a stums. Stacks forms most commonly on chalk cliffs, beacause of the medium resistance to erosion.
Cliffs with weaker rock such as clay tend to stump & erode too quickly to form stacks, while harder rocks such as granite erode in different ways. stacks are often important sites for nesting seabird.
It is also famous for rock climbing.
Stack!
Linear Mode
