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6.3 What is the role of pressure in metamorphism?
- Pressure is related to stress
- Magnitude of force divided by the area the force is applied to
- Normal stress - perpendicular to the surface. Results in change in volume and often shape.
- Shear stress - force parallel to the surface. Results in change of shape, but not volume.
- Strain - the deformation of a rock as a result of stress