After Exploring Much of the West,geologist John Wesley Powell Warned

After exploring much of the West,geologist John Wesley Powell warned in 1874 that

A) the rush of settlers was devastating the western environment.
B) land west of the 100th meridian could not be farmed without extensive irrigation.
C) damming western rivers for irrigation purposes would damage mountains and forests.
D) mining was the only industry that could sustain the western economy.
E) the cattle industry would eventually falter because of severe western winters.