Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Name two energy sources that you would consider to be renewable. Give reasons for your choices.
(i) Energy derived from biomass is a renewable source of energy because waste products are continuously produced. Plants and trees are also grown at all reasonable intervals.
(ii) The energy derived from flowing water, wind, sun and ocean are renewable sources because these sources can be harnessed into energy so long as the present solar system exists.
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