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sedimentary
Carbonic Acid .
Yes, this is what forms sinkholes, and limestone caves.
a mold is formed
Acidic ground water (rain-water that has absorbed atmospheric carbon dioxide to form carbonic acid) forms caves by dissolving the limestone as it flows through the joints & other discontinuities in the rock mass.
The cliff face is eroded by hydraulic action, which over time forms a cave. The back and roof of the cave is then eroded until it breaks through the headland forming an arch. Further erosion on the arch causes it to collapse, thus forming the stack. More erosion on the stack will cause it to form a stump.
A Sandbar
The acid in the water forms it
The formation of stacks begins when the sea attacks small cracks in a headland, which causes them to open. The cracks gradually become larger and turn into small caves. Eventually an arch forms and collapses, leaving a pillar of rock (or stack) standing away from the coast.
sea cliffs
sea cliff
Sedimentary rock
Sea caves form by ocean waves pounding at the base of seashore cliffs.
sanuel
Caves.
The sea first forms sea caves then sea arches then sea stacks and finally it forms sea stumps which will eventually disappear.
Caves usually and mostly forms in sedimentary rocks. Example, Limestone.