Set window back color, show msg, and OK button. When a glacier starts to retreat it drops some of its rocky load and makes a terminal moraine. Photo courtesy of National Park Service. Sorting refers to the variation in grain size in the sediment. Dunes only contain sand because wind isn't strong enough to pick up larger particles and it can't pick up smaller particles because they stick together.
Glaciers are poor sediment sorters because they move anything in their paths.
Using the information you have learned here and in previous sections, fill in the chart below. Inc. All rights reserved.