Answer in one word: (a) A fossil fuel formed by the remains of trees in swampy areas.
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Answer:
coal , petroleum, paraffin wax
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ANSWER:
Coal is the fossil fuel formed by the remains of trees in swampy areas. It takes thousands of years for the coal to develop.
EXPLANATION:
It is mainly formed by carbon, but it also contains nitrogen, sulfur, etc. It is a type of non-renewable energy. It is mainly used for heating purposes. The formation of coal takes place by the dead decaying plants and trees. It is also when they are buried inside the earth for a very long period of time. And after facing the temperature and pressure it gets converted into coal. There are also four variety of coal present in the nature.
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