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Define the following terms.
(i)Mineral
(ii) Ore
(iii) Gangue
(i) Minerals : The elements or compounds found naturally in the earth's crust are called minerals.
(ii) Ore : At some places, a particular metal is found in abundance in minerals, from which metals are obtained at low cost and easily. Such minerals are called ores.
(iii) Gangue : The minerals or ores are mixed with many impurities such as clay and sand called gangue.
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