What is a glacier? How could a massive chunk of ice carve out valleys and create lakes? Explain what glaciation means and identify an example of a lake that was formed by glacial processes.

Answer:

A glacier is a large mass of ice that forms on land and moves slowly under its own weight. As a glacier advances, rocks and sediment frozen into its base scrape and grind against the ground, carving valleys and creating depressions. When the ice melts, water fills these depressions and forms lakes. Glaciation is the process by which glaciers shape and erode the land. The Great Lakes, such as Lake Michigan and Lake Superior, were formed largely by glacial processes.