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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%.