This is called a sinkhole.
how was the titan cave was formed
fingals cave is a cave formed by the same geological processes as those at the giants causeway on the other side of the Irish sea. after a volcano erupted 60 million years ago, hexagonal basalt columns formed as the cave cooled. the cave which has been formed by the sea eroding it away is easy to access. it was discovered in 1772 by sir Joseph banks and a visit to the cave by the composer Felix Mendelssohn inspired him to write his 'Hebrides overture''. popularly known as ''fingal's cave''.+++Not quite: the columns formed as the rock cooled. The cave did not exist until long after the island formed, and was then, as you say, cut by erosion. The volcanism was associated with the inception of the Atlantic Ocean.
Harrison's Cave was formed by rock
Ape cave was formed by a water erosion.
Harold Sergius Cave has written: 'Historical sketch of the Geological survey of Georgia' -- subject(s): Geological surveys, Bibliography, Geology
the calcium in limestone degrades ans a cave is formed
It's a karst cave (i.e. formed in limestone and, in this case too, gypsum, by dissolution) but seems to have a fascinatingly rather more complex geological history than many caves, so I suggest you use my answer here as a start but ferret out the details from elsehere on the Internet, etc.
A Speleogen is a geological formation within a cave that has been created by the removal of bedrock, rather than as a secondary deposit. They are typically formed in limestone or dolostone solutional caves.
Mammoth Cave is formed from Mississippian age limestone rock.
H. S. Cave has written: 'Historical sketch of the Geological survey of Georgia' -- subject(s): Accessible book, Geological surveys, Bibliography, Geology
Mammoth Cave was formed by water erosion over millions of years.