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What is biogas? Name the major component of biogas.
Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Methane is the major component of biogas constituting about 60%.
What are the raw materials used for making biogas?
Describe the construction and working of a biogas plant with the help of a labelled diagram.
Write any two uses of biogas.
Write any two advantages of using biogas.
What is geothermal energy?
What is the source of heat contained in geothermal energy?
Explain how, geothermal energy is used to generate electricity.
State two advantages of geothermal energy.
State two disadvantages of geothermal energy.