Page 154 - SST Class 08

g Iron is used for making heavy machines, g We should reuse old items to reduce the
tools and for construction of buildings and demand for minerals.
bridges. g Metals can be recycled many times which

Conservation of Minerals can help in reducing the demand for fresh
g It takes thousands of years for the formation minerals.
of minerals. But, we are using the minerals POWER RESOURCES
at a much faster rate. Hence, it is necessary Power or energy plays a vital role in our lives. We
to conserve minerals. also need power for industry, agriculture, trans-
g This can be done by reducing the wastage port, communication and defense. Power
during mining. resources may be broadly categorised as conven-

g We should reduce our consumption of items tional and non-conventional resources.
so that demand for minerals can be
reduced.

Oil
Advantages Disadvantages
w Easier to transport (tankers) w Depiction of oxygen due to oil

w Basis of petrochemical industry. spillage and gas leakage.
w Pollutants released caused acid rain.
w Exploration of new fuel is not easy.

Convetional Sources of Energy

Fire Wood Coal
Advantages Disadvantages Advantages Disadvantages

w Easy access w Collection takes time w Extensively available w Polluting source
w Provides energy to a w Polluting w Efficient conversation w Bulky to transport
large number of w Promoting green to electricity
people house effect

w Deforestation

Hydel Power
Advantages Disadvantages

w Non-polluting w Displacement of local community
w Promotes irrigation and fishing w Inundates low
w Cheap w Expensive to setup

Conventional Sources Firewood and fossil fuels are the two main
Conventional sources of energy are those which conventional energy sources.
have been in common use for a long time. Coal : Coal was the basis for the Industrial

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