What Was the Ice Age?By: Nico Medina, Who HQ Illustrator: David Groff Series: What Was? A mesmerizing overview of the world as it was when glaciers covered the earth and long extinct creatures like the woolly mammoths and saber toothed cats battled to survive. 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 traveled, they caused enormous changes in the Earth's