1.  What type of power station affect the environment by polluting the atmosphere with sulfur

         dioxide?

    2.  a) List the 4 non renewable energy sources.

         b) Which non renewable energy source makes the least contribution to global warming?

    3.  Which type of power station has the longest start-up time?

         a) Coal-fired    b) Gas-fired    c) Oil-fired    d) Nuclear

    4.  Which two of the following statements are false about hydroelectric power stations?

         a) They are usually built in mountainous area

         b) They take a long time to start up

         c) They can be used in reverse to store energy from surplus electricity

         d) They are not very reliable

    5.  Which one of these energy sources is unreliable? Coal, wind, plutonium and oil.

    6.  Explain why electricity that is produced from wind farms costs more than electricity produced

         from fossil fuel power stations.