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Joints in metamorphic rocks are due to ___________

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Joints in metamorphic rocks are due to ___________

(a) Indirect stresses

(b) Local stresses

(c) Regional stresses

(d) Local and regional stresses

I got this question in class test.

Question is taken from Occurrence of Joints in portion Joints and Jointing of Engineering Geology

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Right option is (d) Local and regional stresses

To explain I would say: The metamorphic rocks types are heavily jointed in many cases, the joints being of irregular or non-systematic types. These joints are often the result of local and regional stresses acting on rocks as a source of metamorphism.

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