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Geol411 Joints and Veins Essay Preview: Geol411 Joints and Veins Report this essay GEOL411: Joints and VeinsI) Introduction: * Joint = planar fracture or crack in a rock, without shear displacement(Shear fractures do not produce the features found in joints) * Why Study Joints:- Affect strength of rock bodies on escarpments.- Can lead to rock falls.- Affect regional.