粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。
The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.
黄土高原土壤侵蚀极其严重，这不仅导致了土壤生产力的降低，同时也导致了土壤的退化。
The serious soil erosion of the Loess Plateau has led to not only the reduction of soil productivity but also the soil degeneration.
结果表明：人口压力、农业压力、森林资源破坏和薪柴重负是导致高原山地土壤侵蚀的典型相关因子。
The results show that the population growth, farming, forest degradation and fuel wood cutting are the canonical factors causing the soil erosion in the plateau mountains.
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