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A large hole formed when a roof of a cave collapses.
When a very large volume of magma is erupted, the overlying rocks may collapse. The collapse produces a hole or depression at the surface called a caldera.
a sea cave
Erosion of the walls supporting the cave ceiling create an increase in the amount of overlying rock being supported. At some point, the weight becomes too great, and the ceiling collapses.
As water flows through a limestone, some of the rock dissolves. This process can lead to the formation of cavities and caves. If a cave becomes too large and unstable to support the overbearing rock, it will collapse, leaving a sink hole at the surface.
A shake-hole, sink-hole or doline. The collapse may also form an entrance to the cave below, if the slumped material has not filled the passage.
Seems to me you can drop huge boulders or rocks in that hole. Seems they can blast to collapse or cave in that hole
A doline or shake-hole - and depending on the nature of both cave and collapse it can create an entrance to the cave.
cave
A Cave
caldera
A large hole formed when a roof of a cave collapses.
A large hole formed when a roof of a cave collapses.
a sea cave
As far as we know, black holes cannot collapse any further. However, if a star were to collapse and form a black hole, its mass would be the same.
When a very large volume of magma is erupted, the overlying rocks may collapse. The collapse produces a hole or depression at the surface called a caldera.
cave