Ice on the Move

The ice cubes you put in a drink may seem pretty solid to you. But if you had a really, really big blob of ice, it could actually flow, like a very slow river. Gravity would pull it downhill. These moving chunks of ice are called glaciers. They sit in very cold, very high places like the tops of mountains or near the North and South Poles. You might have seen pictures of glaciers from Glacier National Park in Montana. Or maybe you know someone who took a cruise to Alaska.