Ice Ice in the form of glaciers can also change landforms. Glaciers are thick sheets of ice, formed in areas where more snow falls during the winter than melts during the summer. Glaciers seem to stand still, but they actually move. Because of a glacier’s great size and weight, it erodes everything under it. Glaciers erode sediment from one place and deposit it in another. Glaciers are major forces for forming new landforms. As the glaciers of the last Ice Age moved forward, they pushed mounds of rock and soil in front of them. When the glaciers melted, they left behind at their lower ends long ridges of soil and rock. There are two kinds of glaciers. Valley glaciers are found in high mountain valleys. They flow slowly down mountainsides, eroding the mountain under them and forming U-shaped valleys. Only a few valley glaciers remain in North America. And even those are melting rapidly. Continental glaciers are ice sheets that cover large areas of Earth. They cover almost all of Greenland and Antarctica today. But thousands of years ago, when the climate was colder, continental glaciers covered Europe, Canada, and the northern United States. √What are glaciers? Name two types of glaciers.