During the Ice Age, sea levels were 400 feet lower, creating land bridges, like the one between Alaska and Siberia, allowing early humans to migrate. Massive ice caps covering North America contributed to this sea-level drop, reshaping the Earth’s surface through a process called isostasy—where the weight of ice pushed land down, creating bulges elsewhere. This ancient geography played a pivotal role in human movement and settlement patterns. Full Episode: https://www.youtube.com/watch?v=Ld_PwMV