雨水冲走了松散的土壤，穿透了岩石的裂缝。
Rain washes away loose soil and penetrates cracks in the rocks.
在某些情况下，松散的土壤全部被风吹走，只剩下石质化的表层。
In some cases, the loose soil is blown completely away, leaving a stony surface.
相反，草和其他小植物的根可能有助于把松散的土壤碎片固定在一起，从而助于防止风的侵蚀。
In contrast, the roots of grasses and other small plants may help to hold loose soil fragments together, thereby helping to prevent erosion by the wind.
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