coalification
/ˌkoʊlɪfɪˈkeɪʃən/
noun
- The natural process by which plant material turns into coal over millions of years.
- The degree of coalification determines the quality and energy content of the coal.
- Geologists study coalification to understand ancient swamp environments.
- Coalification transforms peat into lignite, then bituminous coal, and finally anthracite.
Synonyms