16. Which of the following is a non-metallic mineral and also used as fertilizer ?
A. Phosphates
B. Nitrates
C. Sulphates
D. All of these
17. Which of the following statements is not true ?
A. Rocks are made up of chemical substances called minerals.
B. We can find the composition of a rock.
C. A rock may contain more than one mineral.
D. None of these.
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Answer:
phosphate
a rock may contain more than one mineral
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