Answer :
i) The inorganic elements or compounds which occur naturally in the earth's crust are known as minerals.
ii) The minerals from which a metal can be profitably extracted are called ores.
iii) The impurity of sand and rocky materials present in the ore is known as gangue.
ii) The minerals from which a metal can be profitably extracted are called ores.
iii) The impurity of sand and rocky materials present in the ore is known as gangue.
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