Coalification means the ___________________?
Correct answer: A. Process of conversion of lignite into anthracite
- A. Process of conversion of lignite into anthracite
- B. Underground gasification of coal
- C. Complete combustion of coal
- D. Direct hydrogenation of coal
Explanation
Coalification is the progressive conversion of low-rank coal such as lignite into higher-rank coal, ultimately approaching anthracite, through geological heat and pressure. It is not combustion, gasification, or direct hydrogenation.
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