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How does coal differ from most rocks?

Answer 1

Most importantly, coal is not a rock.

The chunks of dead plant material that resemble rocks are produced by millions of years of extremely high pressure; however, coal is primarily carbon.

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Answer 2

Roman Acosta

Coal differs from most rocks in that it is primarily composed of organic matter, specifically the remains of plants and vegetation that have undergone a process of compaction and carbonization over millions of years. This organic origin distinguishes coal from most rocks, which are typically formed through geological processes involving the accumulation and solidification of minerals or sediment particles. Additionally, coal has a higher carbon content compared to most rocks and often contains trace elements such as sulfur, nitrogen, and hydrogen, which contribute to its combustible properties.

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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.