Discussion
Fill in the blanks :
The process by which dead vegetation is converted to fossil fuel __A__ at __B__ pressure and __C__ temperature is called as __D__.
Answer: D
The answer is A-coal; B-high; C-high; D-carbonization.
About 300 million years ago, dense forests in low-lying wetlands were buried under soil. As more layers piled up, the dead vegetation was compressed under high pressure and subjected to high temperature deep in the earth, and was slowly converted into coal. Because coal consists mainly of carbon, this slow process is called carbonisation.
Petroleum and natural gas formed from tiny marine organisms, not from land vegetation (B, C). Oxidation is combining with oxygen, the opposite of what happens to buried plants cut off from air (A, C). Low temperature (A) is also wrong.
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