Page 158 - SST Class 08

Tidal Energy : The rise and fall of sea water in
the coastal area are called tides. The energy from
high and low tides is used to turn the turbines
and generate electricity, but the technology is not
yet fully developed. Such electricity is generated
in France, UK, Russia and India.

Biogas Plant
CONSERVATION OF POWER
RESOURCES
Most of the natural resources are limited in stock.
Even some of the renewable resources can
become scarce if they are not used judiciously.

Tidal Energy We are already facing shortage of water at many
places because of excessive exploitation of water.
Biogas : Organic waste such as dead plant and
Scientists predict that coal and petroleum are
animal materials like animal dung and kitchen
going to be exhausted in the near future. Hence,
waste can be converted into a gaseous fuel called
it is important to conserve the natural resources.
biogas. The organic waste is decomposed by
Conservation not only secures our life, but also
bacteria in biogas digesters to emit biogas which
the life of future generations. Making a balance
is essentially a mixture of methane and carbon
between our need and conservation of resources
dioxide. Biogas is an excellent fuel for cooking
is called sustainable development. We should
and lighting and produces huge amount of
follow the three R’s of conservation for sustain-
organic manure each year. Energy is everywhere
able development.
but we can see that harnessing this energy is
g Reduce : We should reduce consumption.
both difficult as well as costly. Each one of us can
make a difference by not wasting energy. Energy g Reuse : We should reuse as many items as
saved is energy generated. Act now and make possible.
brighter energy future. g Recycle : We should recycle discarded
items wherever possible.

Terminology

Exhaustible : capable of being used up
Exploited : make full use of and derive benefit from
Durable : able to withstand wear, pressure or damage; hard-wearing
Luster : a gentle sheen or soft glow
Gypsum : a soft white or grey mineral consisting of hydrated calcium sulphate
Abundant : existing or available in large quantities; plentiful

Social Science-8 158