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    • Oven Gas burner with purple/blue flames.
    Rights: Andrey Bourdioukov, licenced through 123RF Ltd Published 9 September 2015 Size: 99 KB Referencing Hub media

    Natural gas is often used for cooking or heating. Natural gas is a fossil fuel which is a non-renewable resource.

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      Non-renewable energy sources

      Energy comes from many sources, and to describe these sources we use two terms: renewable and non-renewable. Non-renewable energy resources cannot be replaced – once they are used up, they will ...

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