My Ice Age Struggles

Let's go back thousands of years to a time called the Ice Age. The earth is colder than today. Part of the earth has been covered with ice and snow for a long while. How can you survive? "I'm soooo cooooold! I work with others so that we can survive. We are hunters of animals and gatherers of plants. Behind us is a large river of ice and snow called a glacier (glay-shure)."