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Most common rocks composing the sills are ______________

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Most common rocks composing the sills are ______________

(a) Marbles

(b) Shales

(c) Gabbros

(d) Granites

I got this question in unit test.

The origin of the question is Forms of Igneous Rocks topic in division The Study of Rocks of Engineering Geology

1 Answer

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Correct choice is (c) Gabbros

Explanation: The most common rocks composing the sills are intermediate and basic igneous rocks like syenites and gabbros. They may show aphinitic and porphyritic textures.

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