Erosion

(noun.) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it).

(noun.) a gradual decline of something; 'after the accounting scandal there was an erosion of confidence in the auditors'.

(noun.) condition in which the earth's surface is worn away by the action of water and wind.

海勒姆手打

• W erner thought that the earth showed universal strata like the layers of an onion, the mountains being formed by erosion, subsidence, cavings-in. 李贝. 西洋科学史.

埃莉整理