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Book 5: Chapter 23 – Energy Sources
  1. Oil is a chemical substance. It is liquid in form.           It is a fossil fuel. Most of the oil extracted today has been formed from prehistoric organisms whose remains settled at the bottoms of oceans and lakes millions of years ago.
  2. Coal is a black or brownish-black rock. It can burn. It is extracted from the ground by coal mining. It is used primarily as an energy source, either for heat or electricity.
  3. Natural gas is an energy source often used for heating, cooking, and electricity generation. It is also used as fuel for vehicles and as a chemical feedstock in the manufacture of plastics and other commercially important organic chemicals.
  4. Nuclear power is generated using Uranium, which is a metal mined in various parts of the world. Nuclear power plants provided about 5.7 per cent of the world's energy and 13 per cent of the world's electricity in 2012. According to a report in 2013, there are 437 operational nuclear power reactors in 31 countries.
  5. Hydropower or water power is power derived from the energy of falling water and running water, which may be harnessed for useful purposes.
  6. Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electrical power. As an alternative to fossil fuels, it is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation and uses little land.
  7. Solar energy is light and heat from the Sun.Itis harnessed using a range of ever-evolving technologies such as solar heating, solar photovoltaics and solar thermal electricity. Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP).
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