The source of water for the Great Lakes was , which played a major role in forming the lakes during Earth's recent geologic past. if you help me you get a cookie ;)

Melting glaciers when the lakes took their present form.

Nowadays, it's precipitation, rivers, and groundwater springs that bring new water to the great lakes.

Explanation:

answer; i believe the correct answer is (b) dutch van der linde

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.