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Question : 97 of 100
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The correct answer is
Anthracite.
- Anthracite:
- Anthracite is the highest rank of coal. Unlike other types of coal, it is usually considered to be a metamorphic rock.
- It has the highest carbon content of over 87% on a dry ash-free basis.
- Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis.
- It is often subdivided into semi-anthracite, anthracite, and meta-anthracite on the basis of carbon content.
- Anthracite is often referred to as "hard coal"; however, this is a layman's term and has little to do with the hardness of the rock.
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