Petroleum is a fossil fuel derived from ancient fossilized organic materials, such as
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Card 19
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Vast quantities of these remains settled to sea or lake bottoms, mixing with sediments and being buried under
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Card 20
Front
As further layers settled to the sea or lake bed, intense heat and pressure build up in the lower regions. This process caused the organic matter to change, first into a waxy material known as
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Card 21
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Formation of petroleum occurs from hydrocarbon pyrolysis in a variety of mainly
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Card 22
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Burial of organic matter
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Card 23
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Link between biological and geological processes was key =
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Card 24
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Burning fossil fuels has increassed the long term carbon releasse by
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Card 25
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Photosynthesis makes life possible ( part of long term organic c cycle)
