Glaciers of the Great Ice Age covered North America, Europe, and Asia.
They gathered untold tons of earth along their paths. As they began to melt, they left behind rocks and sediment in huge mounds.
Mounds left in front of the glacier as it melted are called terminal moraines. Moraines left along the sides of a glacier as it melted are called lateral moraines.
Kettle Moraine in Wisconsin is a glacial deposit in a depression left by a glacier.