TY - BOOK AU - Medina,Nico AU - Groff,David TI - What was the Ice Age? T2 - What was SN - 9780399543890 (pbk) U1 - 551.7/92 PY - 2019/// CY - New York, New York PB - Penguin Workshop, an imprint of Penguin Random House KW - Glacial epoch KW - Juvenile literature N1 - Lexile : 840L N2 - 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 landscape and climate, leading to the evolution of creatures such as giant armadillos, saber-toothed cats, and woolly mammoths as well as club-wielding Neanderthals and later the cleverer modern humans ER -