Question

6.Which is the poorest quality of coal?
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Answer 1

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Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt. It is of higher quality than lignite and Sub-bituminous coal, but of poorer quality than anthracite.

Answer 2

Answer: Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphalt. It is of higher quality than lignite and Sub-bituminous coal, but of poorer quality than anthracite.

Explanation: Actually I have given you the highest quality of coal also, in case if it is needed, and off course lowest quality that you have asked, PLEASE MARK AS BRAINLIEST.....