2. The cause (s) of this river bank erosion in Montana, most likely is (are):

A. Water

B. Wind

C. Ice

D. Gravity

E. All of the above

Yes, this is the bank of a major river so water is a very important factor in erosion.

Yes, wind plays a major role in the erosion. Can you see the ripples in the water?

Yes, although it is not demonstrated here, Montana does get lots of snow and ice. That would make ice a factor in erosion.

Yes, gravity is a factor in erosion here. The rocks that are seen crumbling are being pulled by gravity along with the other factors.

Yes, all of these are factors in erosion in this photo.