Answer:
GRINDING - Grinding machines fall into five categories: surface grinders, cylindrical grinders, centerless grinders, internal grinders and specials. Surface grinders are used to produce flat, angular and irregular surfaces.
POLISHING - a smooth and shiny surface by rubbing it or by applying a chemical treatment, leaving a clean surface with a significant specular reflection.
CUTTING - sufficiently sharp object is capable of cutting if it has a hardness sufficiently larger than the object being cut, and if it is applied with sufficient force.
LAPPING - a machining process in which two surfaces are rubbed together with an abrasive between them, by hand movement or using a machine.
BLASTING - a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface or remove surface contaminants.