Sinkholes on glaciers are called moulins, French for mill.
Once formed, the shaft will stay open as long as there is meltwater to feed the moulin.
If the meltwater freezes, the moulin will begin to fill up with snow and close up.
Sinkholes on glaciers are called moulins, French for mill.
Once formed, the shaft will stay open as long as there is meltwater to feed the moulin.
If the meltwater freezes, the moulin will begin to fill up with snow and close up.
