The Conversation
During ice ages, ice sheets like the one in Greenland have covered much of Earth's surface. Thor Wegner/DeFodi Images via Getty Images Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. How many ice ages has the Earth had, and could humans live through one? – Mason C., age 8, Hobbs, New Mexico First, what is an ice age? It’s when the Earth has cold temperatures for a long time – millions to tens