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1 February, 04:40

Which of the following is a nonmetallic mineral resource?. A. wood. B. iron. C. coal. D. aggregate

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  1. 1 February, 07:30
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    A. Wood

    Wood is a heterogeneous, hygroscopic, cellular and anisotropic material. It consists of cells, and the cell walls are composed of micro-fibrils ofcellulose (40% - 50%) and hemicellulose (15% - 25%) impregnated with lignin (15% - 30%).
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