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Any of the chemical or mechanical processes by which objects exposed to the weather are worn or broken down.
(Physical Geography) the mechanical and chemical breakdown of rocks by the action of rain, snow, cold, etc
weath•er•ing(ˈwɛð ər ɪŋ)
the process by which various natural agents, as wind and water, act upon exposed rock, causing it to disintegrate to sand and soil.
The decay and break up of rocks on the Earth’s surface by natural chemical and mechanical processes.