The deformation characters of the broken rocks are the important factors that affect the roof caving and surface subsidence above goaf in coal mining.
破碎岩石的变形性质是影响采空区覆岩垮落与地表沉陷的重要因素。
They built thousands of circular stone windbreaks and gardened inside them, and used broken volcanic rocks to keep the soil moist.
他们建造了成千上万的圆形石质防风林并在其中种植花草，还用破碎的火山岩来保持土壤湿润。
The rocks get broken down into smaller and smaller particles as they are weathered.
岩石在风化过程中被分解成越来越小的颗粒。
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