Two relatively large plates, one of granite and one of slate, are subjected to a tensile stressof 40 MPa. If the specific surface energies for granite and slate are 0.3 J.m-2 and 0.7 J.m-2, respectively; while modulus of elasticity values are 69 GPa and 92 GPa, respectively forgranite and slate. Determine the maximum length of a surface crack that is possible without fracture. b) With the knowledge of geology, briefly describe why these two rocks showed different values

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