Define the terms: (i) mineral (ii) ore, and (iii) gangue. .

(i) Mineral: The elements or compounds, which occur naturally in the earth’s crust, are known as minerals

(ii) Ore: Minerals from which the metals can be extracted profitably are called ores.

(iii) Gangue: Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.