Question 1:
Name two energy sources that you would consider to be renewable. Give reasons
for your choices.
Answer:
Two renewable sources of energy are as follows:
(a) Sun: The energy derived from the Sun is known as solar energy. Solar
energy is produced by the fusion of hydrogen into helium, fusion of helium
into other heavy elements, and so on. A large amount of hydrogen and
helium is present in the Sun.
Therefore, solar energy can replenish on its own. The Sun has 5 billion years
more to burn. Hence, solar energy is a renewable source of energy.
(b) Wind: Wind energy is derived from air blowing with high speed. Wind
energy is harnessed by windmills in order to generate electricity. Air blows
because of uneven heating of the Earth. Since the heating of the Earth will
continue forever, wind energy will also be available forever.
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