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How do fossil fuels form?

Answer 1

Fossil fuels are formed when organic matter that has been buried deep within the earth are subject to heat and pressure over millions of years.

The image below shows how oil and natural gas form:

This image shows how coal forms:

In both cases, heat and pressure are critical to the formation of the fossil fuel. In the case of oil and natural gas, the organic material is marine in origin, whereas coal is formed from ancient peat forests. In both cases, the dead organisms are buried over time and the extreme heat and pressure converts these dead organisms into either coal, natural gas, or oil.

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Answer 2

Roman Acosta

Fossil fuels form from the remains of plants and animals that lived millions of years ago. Over time, the organic matter undergoes heat and pressure, turning into coal, oil, or natural gas.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.