The depths are
- Boston 4,100 feet (1250 meters)
- Chicago 2,950 feet (900 meters)
- Montreal 10,170 feet (1.9 miles! or 3,100 meters)
- Toronto: 6,890 feet (2,100 meters)
My home region was once under over a mile of ice. To think this and the radical changes between then and now are 100 percent natural. Nature is violent and climate change can be world altering.