It is when the trachea collapses
Trachea has C shaped cartilage rings. This makes the anatomical arrangement unique. So that trachea can contract and relax but does not collapse.
When a volcano collapses on itself a caldera is then formed.
I think you die. The trachea is like a tube connecting the mouth/oral airway to the lungs. The trachea will stop working if it becomes blocked eg by a foreign body - oh no I shouldn't inhale marbles!, or if it collapses in on itself. If the trachea is blocked there is no gas exchange with blood in the lungs. ie hypoxia (low oxygen and hypercapnoea ( high carbon dioxide levels) result which rapidly lead to cardiac dysfunction and death.
sinkhole
What happens when a bolus gets stuck in the trachea is that it makes breathing difficult. If the food is not removed from the trachea, the person could die.
The collapses star gets squeezed by collapses gas and turns into a black hole.
A Headland is formed
Because if it collapses you will not be able to breathe....and will die.
it will all dissappear
It collapses.
Yes, if the star is massive enough when the core collapses a supernova explosion happens.