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The term “intrusion” is basically associated with which type of rock?

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The term “intrusion” is basically associated with which type of rock?

(a) Igneous rock

(b) Sedimentary rock

(c) Metamorphic rock

(d) Not associated with any type of rock

The question was posed to me during an interview for a job.

My doubt stems from Rocks Basic Terms in section Structural Features of Rocks of Engineering Geology

1 Answer

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Right option is (a) Igneous rock

The explanation: Igneous rocks are formed from cooling and crystallization of hot molten material called magma/lava depending on the place of occurrence. The magma gets intruded or injected into the pre-existing rocks of any type- called the host rocks and takes variously shaped forms on cooling. These forms are commonly termed as Intrusion.

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