Moulins are rather like vertical streams or deep, leaky potholes in the glacier filled with water. The size of the debris on the moraine is quite variable. Several huge boulders were supported by columns of ice somewhat like a pedestal rock. Alas, the helicopters returned and I took one last look across the Mendenhall Glacier to the mountains beyond before boarding the helicopter for the trip back. As such, the visitors ask numerous questions and make many comments about several of the glacier's features.
Many people are interested in how deep the crevasses are.
Many people ask who painted the glaciers blue. Numerous people have asked the guides how the highways on the glacier were constructed. Others were disappointed in how dirty the glaciers were and wondered why they didn't keep them clean. Explain where the debris comes from. Still others wondered if the group might encounter some wildlife.