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The light weight aggregates are obtained from

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The light weight aggregates are obtained from

(a) Sedimentary rocks

(b) Metamorphic rocks

(c) Igneous rocks

(d) Volcanic source

I had been asked this question in an internship interview.

The query is from Source of Aggregates topic in section Aggregates and Testing of Aggregates of Concrete Technology

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Right option is (d) Volcanic source

The best I can explain: For making light weight masonry blocks (to improved their thermal and insulating properties and nailing characteristic).

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