Glaciers carved thse features of the Driftless Area...?
A. prairie grasslands
B. deep river valleys
C. vast plains
D. Eagle Mountains
B. deep river valleys
The Driftless Area, primarily located in parts of Wisconsin, Minnesota, Iowa, and Illinois in the United States, is characterized by its steep, forested ridges, deeply carved river valleys, springs, waterfalls, and cold-water streams. Glaciers from the last ice age bypassed this region, and as a result, the landscape was not smoothed out by glacial drift (sediments deposited by glacier movement). Thus, the deep river valleys and unique topography are the signature features carved out by water erosion and not by glacial activity, distinguishing this region from surrounding areas that were glaciated.