Since these fuels are plant and animal products, the source Sources of Energy

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1) A of cow-dung and water is made in the mixing tank from where it is fed into the .
2) micro-organisms that do not require oxygen decompose or break down complex compounds of the cow-dung slurry.
3)Bio-gas is an excellent fuel as it contains up to 75% .
4)India is ranked in harnessing wind energy for the production of electricity.
5)The wind speed should also be higher than km/h to maintain the required speed of the turbine.
6) Artificial satellites and space probes like Mars orbiters use as the main source of energy.
7)The difference in sea-levels due to high and low tides gives us energy.
8) The kinetic energy possessed by huge waves near the seashore can be trappedto generate electricity, this is called energy.
9)The water at the surface of the sea or ocean is heated by the Sun while the water in deeper sections is relatively cold. This difference in temperature is exploited to obtain energy in -energy conversion plants.
10)The nuclear energy is generated in a process called .