Moulins on Glaciers By Kaushik Saturday, December 06, 2014 Environment, Nature, Science No comments Just like rainwater dissolves the bedrock on the Earth’s crust and form sinkholes, meltwater on a glacier’s surface can melt ice and form sinkholes too. Sinkholes on glaciers are called moulins, French for “mill”. Moulins form when summer meltwater streams on the surface..