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Tempering. (in metallurgy), a type of heat treatment, in which a quenched alloy is reheated to a temperature below the first critical point, is held at that temperature, and is subsequently cooled. The term âtemperingâ is mainly applied to steels.
Weathering is the process of breaking rocks down by chemical or  physical means.  Erosion is the process of carrying away weathered material.   Deposition is the processâ¦ of this material settling back down.