Horizon C is relatively unweathered parent material form which the mineral components of the above layers are derived.

C 水平层是相对未风化的母质土，其它层的矿物都源于此。

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Horizon C is relatively unweathered parent material form which the mineral components of the above layers are derived.

C 水平层是相对未风化的母质土，其它层的矿物都源于此。

youdao