coal·i·fi·ca·tion 
(kō′lə-fĭ-kāshən)
(kō′lə-fĭ-kāshən)n.
Compression and hardening over long periods of time, the processes by which coal is formed from plant materials.
| 单词 | coalification |
| 释义 | coal·i·fi·ca·tion (kō′lə-fĭ-kāshən)n. Compression and hardening over long periods of time, the processes by which coal is formed from plant materials. |
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