A sinkhole.
When rock above a cave collapses, a sinkhole is formed.
Caldera
CALDERA
A caldera
When a volcanic cone collapses it forms a caldera.
When rock above a cave collapses, it forms a sinkhole. Sinkholes are depressions in the ground that are often caused by the erosion of underground caves or channels.
It is called weathering.
caverns
calderacalderaIt forms a caldera.
When rock above a cave collapses, a sinkhole is formed.
Caldera
another floor
Primarily by diverting any surface streams and run-off water they intercept, underground. Otherwise, none.... unless a passage roof collapses and forms a doline.
i think that when the water reaches the surface, it dissolves into the ground which is called infiltration (the movement of water through soil) which then flows down from the tiny spaces in the bedrock and then it forms into a ground water, which is then released into and ocean or a lake.
CALDERA
A caldera
The water that forms far below the surface is called a Deep Current.