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_________ is an igneous rock used for rubble masonry, road metal, foundation work, etc.

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_________ is an igneous rock used for rubble masonry, road metal, foundation work, etc.

(a) Basalt

(b) Granite

(c) Laterite

(d) Kankar

The question was asked by my school teacher while I was bunking the class.

I would like to ask this question from Common Building Stones of India in portion Stone and Brick Masonry of Construction & Building Materials

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Right answer is (a) Basalt

The best explanation: Basalt and trap are hard and tough igneous stones which is difficult to work. Its specific gravity is 3 and compressive strength varies from 150 to 185 Newton per mm square. Its weight varies from 18 to 29 kN per metre cube.

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