As we discovered in the Grand Canyon, one of the most easily observable sedimentary structures isbedding or layering. However, not all regions have experienced the spectacular erosion that the Grand Canyon has. In mountainous areas, plate tectonic convergence has exposed various sedimentary layers by tilting, folding, and/or faulting them. Resistant rocks still erode to form cliffs, and less resistant rocks still form low slopes or valleys. Folding and faulting can repeat the same sedimentary layers multiple times, creating a series of repeating ridges and valleys.
Differential Weathering - Lewis Range, MT.
Which of the following is true regarding the resistance to erosion of the layers specified by the Problem 8 placemarks?
A. Problem 8a is less resistant and Problem 8b is more resistant
B. Problem 8a is more resistant and Problem 8b is less resistant
C. Problem 8a and Problem 8b have similar resistances to weathering and erosion