They can take a year to move as far as you can walk in a few minutes. When a piece of a glacier breaks off and floats in the water, it's called an iceberg. The heavy snow crushes the layers below and forms a mountain of ice. As the glacier moves slowly down the mountain, it grinds against the ground and the walls of the valley to make it deep and wide.
Glaciers cover about six million square miles which is about three percent of the earth's surface.
You're an artist exploring the beauty of glaciers. Create a picture showing how a glacial area might change over millions of years. Create the picture as a series of panels like a cartoon. Glacier Forecaster . You're a weather forecaster trying to predict the next ice age.