Some are made because of limestone rock that is more easily eroded away by water. The surrounding rock stays, but the limestone is eventually dissolved leaving a cavern.
i don't know that's why I asked you
Yes. That is why caves and other types of caverns are most often made of (or found in) limestone.
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As it starts to break down all of the rock it starts to create space therefor a cave or cavern can be made.
the paleo-indians :)
calcium carbonate
Howe Caverns is a cave located in New York, near Albany. It is thought to be at least a million years old and is made of limestone.
Carlsbad Caverns.
The Linville Caverns are a network of limestone caves located in North Carolina, USA. They are open to the public for guided tours, offering a chance to see unique geological formations such as stalactites and stalagmites. The caverns are known for their underground streams and spectacular rock formations.
Caverns can be under water and underground.
Caverns of Minos happened in 2012.
Carlsbad Caverns is located in New Mexico.
Caverns of Xaskazien happened in 1995.
Caverns of Xaskazien was created in 1995.
Caverns of Zoarre happened in 1984.
Caverns of Zoarre was created in 1984.
Caverns of Mars was created in 1981.