When a boat collapses, it is often referred to as "foundering." This term describes a situation where a vessel takes on water and sinks due to various factors such as structural failure, flooding, or severe weather conditions. In some cases, the term "capsizing" is used if the boat tips over and turns upside down. Both scenarios can lead to significant dangers for those on board.
A boat collapses when the engine is not functioning well.
Collapses? Don't know what you mean by that but if you mean flips over, it's called "capsizing". I hope it helped. If not, elaborate a bit more and I'll see what I can do. Ch33rs
When a volcano collapses a very wide crater is called a caldera.
pneumothorax
globules
It is called weathering.
It is called weathering.
puncture
Its called a "caldera".
A sinkhole.
A harbour boat is of course called a harbour boat.
the boat is called a waka