Fresh water is a limited resource because a. most water is polluted.
b. most surface water contains salt.
c. it is controlled by powerful governments.
d. dams have limited the flow of fresh water.

I think B

Explanation:

B: most surface water contains salt

Explanation:

if it contains salt that means you can;t drink it which LIMITS fresh water

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."