colchrishadfield:

21,000 years ago, the ice over Montreal was 3 kilometers thick, and dwarfed the Sears and CN Towers. The land is still rising back up like a sponge from the great weight of the ice. Conditions changing over time. (xkcd)

colchrishadfield:

21,000 years ago, the ice over Montreal was 3 kilometers thick, and dwarfed the Sears and CN Towers. The land is still rising back up like a sponge from the great weight of the ice. Conditions changing over time. (xkcd)