In the process of coal formation the first form of true coal is called

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Coal formation continues as increasing heat and pressure turns peat into lignite brown or black coal. It is the first true coal.

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Answer: Lignite

Explanation:

Lignite is yellow to dark brown colored coal which is considered to be the first true form of coal during coal production.The shallow form of peats give rise to lignite and due to its low heat content lignite is considered to be the lowest form of coal.The carbon content of lignite is generally 60-70%.

The correct answer would be b