Question

how did the great ice age affect the geography of north america ?

Answer 1

Well the glaciers slid across parts of the north making flat plains, and when the ice melted, it cut and eroded away the dirt and rock making mountains and canyons and rivers. Also when the ice melted it drained into the flat lower areas made by the previous glaciers thus making lakes and contributing to the rivers that were already cutting through the mountain/plains areas.

Answer 2

turned everything around