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A sinkhole is formed when the roof of a cave collapses.
A large hole formed when a roof of a cave collapses.
Its called a "caldera".
A large hole formed when a roof of a cave collapses.
A sinkhole forms.
Shakehole or Sinkhole - when the collapse extends to the surface. (Not all cave roof collapses disturb the surface above.)
A Shakehole or Sinkhole.
Sinkholes form typically as limestone dissolves. A caldera is created by the collapse of volcanic vault ceilings.
sinkhole
You run for your life ;)
Caldera
another floor