another floor
A sinkhole forms.
The large circular depression at the top of a volcano that forms when the roof of the magma chamber collapses is called a caldera. Calderas can be huge in size and are formed during explosive volcanic eruptions or when the magma chamber empties and the summit collapses into the void left behind.
When the roof of a volcano collapses, it can form a large crater known as a caldera. Calderas are circular depressions usually larger than the original volcanic vent and are often filled with water or subsequent eruptions.
When rock above a cave collapses, a sinkhole is formed.
sinkhole
You run for your life ;)
Shakehole or Sinkhole - when the collapse extends to the surface. (Not all cave roof collapses disturb the surface above.)
A sinkhole is formed when the roof of a cave collapses.
the roof of the magma chamber collapses forming caldera
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.