coalification

/koh-luh-fi-key-shuhn/US // ˌkoʊ lə fɪˈkeɪ ʃən //

煤化,煤炭化,煤化现象,煤化作用

Definitions

n.名词 noun

1
Geology.
- : the conversion of plant material into coal by natural processes, as by diagenesis and, in some instances, metamorphism.