When the ice sheets melted at the end of the last glacial period, the planet didn't just warm up and move on. The weight of those ice sheets, in some places miles thick, had been pressing down on the crust for tens of thousands of years. Remove that load in a geological instant, and the entire system has to adjust. The northern continents began rebounding upward, a process called isostatic rebound, and that rebound is still happening today. At the same time, trillions of tons of meltwater poured back into the ocean basins, redistributing mass across the planet's surface and altering the stress field within the crust. He argues that much of the volcanic and seismic activity we see today, particularly in tectonically sensitive regions, may be a delayed response to that rapid deglaciation. The Earth is still settling from the end of the Ice Age, and that settlement expresses itself in earthquakes, volcanism, and crustal adjustment. It's a reminder that the planet operates on timescales far longer than human memory, and that the consequences of catastrophic change can echo for millennia.