Discussion
Which of the following is not a renewable source of energy ?
Answer: B
The source that is not renewable is natural gas.
Natural gas is a fossil fuel formed from organic matter over millions of years. Once extracted and burned it cannot be replaced on any human time scale, so it is non-renewable.
Geothermal energy (the Earth's internal heat), flowing water (hydropower) and biomass (plant and animal matter that regrows) are all renewable sources.
Like coal and petroleum, natural gas also releases carbon dioxide when burned, whereas the renewable sources are replenished by natural processes.
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