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What is sand composed of?

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in Basic Civil Engineering by (111k points)
What is sand composed of?

(a) Silica

(b) Silicon

(c) Silicon oxide

(d) Quartz

The question was posed to me in semester exam.

I would like to ask this question from Source and Classification of Sand in portion Materials for Construction of Basic Civil Engineering

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Right choice is (a) Silica

The explanation: Sand is composed of small grains of silica (SiO2). It’s also called silicon dioxide.

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