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is a grade between lignite and anthracite.

1. Steam coal
2. Bituminous coal
3. Graphite
4. None of the above

Correct answer: Bituminous coal

Solution

Bituminous coal is the middle rank in the coalification series, lying between lignite and anthracite. Lignite is lower-grade and anthracite is the highest-grade coal, so the grade between them is bituminous coal.

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