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The type of joint occurring in igneous rocks during cooling is ___________

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The type of joint occurring in igneous rocks during cooling is ___________

(a) Shear joints

(b) Tensile joints

(c) Compression joints

(d) Bend joints

This question was posed to me in an online quiz.

The doubt is from Classification of Joints topic in section Joints and Jointing of Engineering Geology

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Right option is (b) Tensile joints

The explanation: Tension joints are also produced in igneous rocks during their cooling. Joints produced in many rocks during the weathering of overlying strata and subsequent release of stresses by expansion are also thought to be due to the tensile forces.

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