A. 物质成分与下伏基岩成分密切相关
B. 是位于地表以下、基岩风化带以上的一层松散破碎物质
C. 具有较大的孔隙率、较高的含水量，作为建筑物地基，强度较低
D. 厚度与地形、降水量、水中化学成分等多种因素有关
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