有空看看，当做学英语好了 土的分类soil classificationboulder漂石cobble卵石coarse grained soil(gravelly and sandy)粗粒土gravel石子coarse sand粗砂medium sand中砂fine sand细砂silty sand粉砂fine-grained soil(silty and clayey)细粒土clayey soil粘性土clay粘土silty clay粉质粘土silt粉土sandy silt砂质粉土clayey silt粘质粉土Residual soil 残积土clay minerals 粘土矿物secondary minerals 次生矿物fill (soil) 填土soft clay 软粘土expansive (swelling) soil 膨胀土peat 泥炭frozen soil 冻土over consolidated soil 超固结土normally consolidated soil 正常固结土under conso
