Answer:
Yes,
sun is the ultimate source of energy directly or indirectly, all the forms of
energy derived from solar energy. (1)
(i) Non-renewable sources of energy Fossil fuels like coal, petroleum and
natural gas are formed due to burial of large plants and ancient creatures
whose ultimate source of energy is sun. (1)
(ii) Renewable sources of energy They are indirectly derived
from solar energy such as
(a) Energy from flowing water Clouds are formed when water
in lakes, rivers, seas, etc evaporates due to solar energy. They bring rainfall
and snow fall. The rain and melting snow feed rivers, streams, etc. This
flowing water can be used for getting hydroelectricity.
(b) Wind energy Wind energy arises due to uneven heating
of the earth's surface by the sun rays at two different adjoining places. Due
to this, wind possesses kinetic energy.
(c) Bio energy Plants in the process of photosynthesis
converts the solar energy into food (chemical energy). This food is consumed by
animals. Thus, the animal wastes and remains of the plants constitute bio-mass which
can be utilised as a source of energy.
(d) Wave energy The waves are generated by strong winds
(due to solar energy) blowing across the sea.
(e) Ocean thermal energy Sun is responsible for the
temperature difference between the water at the surface and water at depth in
seas and oceans. (2)
(iii) Solar heating devices They derive their energy directly
from solar energy and convert it into other usable forms of energy. Thus, the
energy from various sources are consider to have been derived from the sun.
(1)
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