PBS
Pbs Learning Media: Glaciers
Featuring images of glacier formations, this interactive resource adapted from the National Park Service explains what glaciers are, where they are found, how they form, and how they move.
National Snow and Ice Data Center
National Snow and Ice Data Center: All About Glaciers: Why Do They Move?
Explains what the forces are that cause glaciers to move, what their movement looks like, how they advance and retreat, or even surge forward.