When is it appropriate to use the term pressure in geology?
What will be an ideal response?
Answer: Pressure should be used when considering a fluid, where there is no shear stress. Pressure is correctly used about pore fluids and magma, but also about salt, which over geologic time behaves more or less like a fluid. Metamorphic petrologists also use pressure when describing the general pressure resulting from rock overburden in the crust, thus implicitely relating to the hydrostatic or lithostatic model.
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Diamond and graphite are two minerals with the same chemical composition, but extremely different
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