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创建: 2021-05-10T18:03:44

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  • At first the fragments of rock lie loosely together. But gradually, over many years these thick layers build up. This build up becomes heavy and presses down on the layers beneath it. Compaction is the pressing down of layers forcing the sediments to fit closer together.

    创建: 5/10/21

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http://aims.fao.org/aos/agrovoc/c_2198dd46

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