What is the origin of smooth troughs cutting across the landscape in the Great Lakes area?
A) the areas were covered by soft marine sediments
B) a huge flood coming from Iowa flowed toward the Great Lakes
C) glaciers carved the smooth troughs
D) all of these

Question

Quizplus · Accepted Answer

Glaciers carved the smooth troughs in the Great Lakes area. As they advanced and retreated over thousands of years, they sculpted the landscape, creating the troughs and other features.

What Is the Origin of Smooth Troughs Cutting Across the Landscape