A shakehole (or sinkhole) - it can form an entrance to the cave, or block it entirely. Also swallow hole.
It's important to realise that the existence of a shakehole does not necessarily mean an enterable cave lies below: the dissolved carbonate rock below may have been carried away in a multitude of fine conduits as in chalk, rather than a discreet passage.
When rock above a cave collapses, a sinkhole is formed.
It is called weathering.
It is called weathering.
When a volcanic cone collapses it forms a caldera.
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.
When rock above a cave collapses, a sinkhole is formed.
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.
It is called weathering.
It is called weathering.
It is called weathering.
It is called weathering.
When a volcanic cone collapses it forms a caldera.
Calcite, usually, from the limestone above the cave. (Or gypsum, if the cave is in that rock)
Metamorphic rock.
Sinkholes often occur when underground rivers erode the rock beneath the Earth's surface. Eventually, the land above is no longer sufficiently supported and collapses into the cave that has developed beneath it. They are more common in places with limestone, as it is easily eroded.
A Boulder, or Talus Cave rather stretches the definition of "cave", but it's simply a void or set of voids left between fallen boulders and their source rock-face. A cave's chamber that is heavily obstructed or even terminated by collapsed rock is often called a "boulder chamber", but it's not correct to say that collapses form caves. They don't - they modify them.