Discussion
The variety of coal in which the deposit contains recognizable traces of the original plant material is
Answer: D
Peat still shows recognisable traces of the plants it formed from - leaves, twigs and roots are often visible in it.
It is the first stage of coal formation, with only about 25 to 35 per cent carbon. With increasing pressure and time it becomes lignite, then bituminous coal, then anthracite, and all plant structure is lost.
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