For 10 points, name this deformation process that shares its name with the slow downhill movement of soil and rock.
This behavior can be effectively modeled by circuits of springs and dashpots in the Kelvin-Voigt model. As a rule of thumb, this process becomes noticeable when metals are heated to approximately thirty percent of their melting point. Subtypes of this process that are caused by diffusion of vacancies through a crystal lattice are named for Nabarra-Herring and Coble. The tertiary stage of this process sees epsilon increase as (*) "necking" behavior begins. One type of this process occurs via the movement of atoms along a grain boundary. It occurs when a material is exposed to high levels of stress below the yield point. For 10 points, name this deformation process that shares its name with the slow downhill movement of soil and rock.
This behavior can be effectively modeled by circuits of springs and dashpots in the Kelvin-Voigt model.
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