metamorphism -- n. The process of altering the chemical or mineralogical composition of a rock through different amounts of heat and pressure below the surface of the Earth; metamorphose- v; metamorphic - adj.
metamorphism The processes of recrystallization, textural and mineralogical change that take place in the solid state under conditions beyond those normally encountered during diagenesis.
Shock Metamorphism
By far we find the best indicators of an impact event in the rocks that were close enough to ground zero to experience shock pressures of 20 to 500+ kb.
Thermal Metamorphism Is the metamorphic alteration of rock because of intense heat released from processes related to plate tectonics.
Contact Metamorphism:
Alteration of a rock, mainly by heat, which occurs adjacent to a dike, sill, magma chamber or other magma body.
Contour Line:
A line on a map that traces locations where the value of a variable is constant.
 See also: Surface, Location, Plate, Sediment, Area
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