Energy from various sources is considered to have been derived
from the sun. Do you agree? Justify your answer.
Answers
Yes, sun is the ultimate source of energy , all the forms of energy are derived from solar energy.
(i) Non-renewable sources: of energy like coal, petroleum and natural gas are formed due to burial of large plants and ancient creatures
(ii) Renewable sources :of energy They are indirectly 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.
(b) Wind energy :Wind energy arises due to uneven heating of the earth’s surface by the Sun rays at two different adjoining places.
© Bio-energy Plants: in the process of photosynthesis converts the solar energy into food . This food is consumed by animals.
(d) Wave energy :The waves are generated by strong winds due to solar energy
(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.
(iii) Solar beating devices: They derive their energy directly from solar energy and convert it into other usable forms of energy.
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Answer:
Sun is the ultimate source of energy. It is true that energy from various sources have been derived from the sun. Following are explanations for this:
(a) Plants harness solar energy to make biomass. This biomass was converted into fossil fuels. So, energy in fossil fuels came from sun.
(b) Firewood and gobar gas have got energy from sun; as explained in previous point.
(c) Water cycle on earth happens because of heat from the sun. So, kinetic energy in water is because of sun.
(d) Waves and ocean currents are caused because of heating from the sun. So, different kinds of energy from ocean have sun in their root.
(e) The earth was made after a piece from the sun took shape of this planet. So, geothermal energy or energy from nuclear power plant have come from the sun.