Define the following terms.
(i) Mineral
(ii) Ore
(iii) Gangue

Explanation

(i) Minerals : These are the combined states of metals and non-metals present in earth's curst.
(ii) Ores : The minerals from which metals can be conveniently and profitably extracted, are called ores.
(iii) Gangue : It represents the earthy impurities such as mud, sand and clay associated with the ore.