What Was the Ice Age?

Go back 20,000 years ago to a time of much colder global temperatures when glaciers and extensive sheets of ice covered much of our planet. As these sheets traveledthey caused enormous changes in the Earth’s landscape and climateleading to the evolution of creatures such as giant armadillossaber-toothed catsand woolly mammoths as well as club-wielding Neanderthals and later the cleverer modern humans.