When in U. S, history did pollution start to become an issue? Explain why pollution was not an issue prior to this time period. Answer in at least 3 complete sentences.

pollution began to be a problem in 1800's.

Explanation:

more people meant more rubbish. industry also added to this

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.