Millions of years ago, huge numbers of microscopic animals and plants - plankton - died and fell to the bottom of the sea., Their remains were covered by mud., As the mud sediment was buried by more sediment,, it started to change into rock as the temperature and pressure increased., The plant and animal remains were altered chemically by this process, and slowly changed into crude oil and natural gas..

CAX KS3 energy how fossil fuels are made

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