Energy that Transforms
(a) Why is the Solar Cooker box covered with a plane glass plate?
(b) Why is energy of water flowing in a river considered to be an indirect form of solar energy?
(c) How is the fission of nucleus brought about?
Name the type of nuclear reaction by which the Sun produces its energy. List two conditions which are present at the centre of the Sun responsible for this reaction.
(i) Name the four gases commonly present in biogas.
(ii) List two advantages of using biogas over fossil fuels.