coalification

noun Geology.

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

Origin:
1910–15; coal + -i- + -fication

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Coalification is always a great word to know.

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Example sentences

Methane is formed in coal during the coalification process and also as a result

of bacterial activity.

It is likely that these products are also derived from lignin, especially

lignin that has been altered by coalification reactions.

Coalification affects not only the organic matter in coal, but the mineral

matter as well.

Conclusions: that start in the peat stage and continue through coalification.

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coal·i·fi·ca·tion