A stalactite.
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A stony spike hanging from the roof of a cave is a stalactite. Stalactites are formed by minerals deposited by dripping water in caves, creating the icicle-like formations that hang from the ceiling.
I would call it a cave in.
They are formed by the deposit of minerals. They are left behind by evaporation.
A large hole formed when a roof of a cave collapses.
When the roof of a cave wears away and the ground sinks in, it forms a sinkhole. Sinkholes are depressions or holes in the ground that are typically caused by the collapse of surface material into underground caves or voids.
Snow is heavy and as it piles up on a flat roof it gets heavier. Too much snow on a roof and it will cave in.