Maria visited the mountains in Wyoming and became interested in the different ways that mountains and valleys form. How do mountains and valleys develop from a series of normal faults? A. A footwall slips down to form a valley at a converging plate boundary. Rock on either side of the valley becomes the mountains.
B. Walls of rock grind past each other in opposite directions. This pushes one side up above the other to form the mountains.
C. Compression causes rock to fold and bend, but not break, in the middle of a plate. The rock that folds upward becomes a series of mountains.
D. A hanging wall slips down at a diverging plate boundary. The slab of crust that falls forms a valley, and the slabs on each side form mountains.