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Ferrous minerals
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Non-ferrous minerals
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Metallic minerals which contain iron are called ferrous minerals, e.g. iron ore, manganese, nickel, cobalt, etc. | Metallic minerals which do not contain iron are called non-ferrous minerals, e.g. copper, bauxite, tin, etc. |
Conventional Sources of Energy |
Non-conventional Sources of Energy
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Conventional sources of energy are those sources which have been use since the early times. | Non-conventional sources of energy have generally been identified in the recent past. |
They are exhaustible except hydro-energy. | They are inexhaustible. |
They cause pollution when used as they emit smoke and ash. | Generally these are pollution-free. |
Their generation and use involve huge expenditure. | Low expenditure required. |
Very expensive to maintain, store, transmit as they are carried over long distances through transmission grids. | Less expensive due to local use and easy maintenance. |
Examples are – coal, natural gas, water, fire-wood. | Examples are – geothermal energy, solar energy, wind energy, tidal energy, biogas energy, nuclear energy. |