oil 40% coal 25% natural gas 25% -hydroelectric 2% nuclear 8% ▲ Figure 1.7.21 a Give the percentage supplied by hydroelectric energy. b Identify any of the sources that are renewable. c Explain what is meant by a renewable source. d Give two other renewable sources. e If energy is always conserved, explain the importance of developing renewable sources. [1] [1] [2 Total
