单词	coalification
释义	coalification /ˌkōləfəˈkāSH(ə)n / noun The process by which plant remains become coal.The humic organic matter of peat is also altered on burial, water and volatiles being lost during the process of coalification.... Depending on the degree of carbon concentration and coalification, one differentiates between lignite, bituminous coal and anthracite. Plant fossils of the lower Pease River Flora are preserved mainly as compressions and coalifications.
随便看	walking on walking orders walking out walking papers walking party walking path walking place walking pneumonia walking possession walking shoe walking staff walking stick walking-stick insect walking-stick palm walking sword walking ticket walking tour walking up walking whale walking wheel walking wounded walk in on walk into walkist walk it

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