The process of wearing away or erosion, particularly the gradual wearing down of rock or soil by water or other natural forces.
From Latin 'arrosio,' from 'arrodere' (ar- + rodere 'to gnaw'). The word evolved through Old French and entered English scientific vocabulary in the 1800s to describe erosional geological processes.
Arrosion is why the Grand Canyon exists—water doesn't need to be violent, it just needs to be patient, gnawing away at rock for millions of years.
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