Nouns

(n)erosion, eroding, eating away, wearing, wearing away(geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively
(n)erosioncondition in which the earth's surface is worn away by the action of water and wind
(n)erosiona gradual decline of something“after the accounting scandal there was an erosion of confidence in the auditors”
(n)corrosion, corroding, erosionerosion by chemical action