沙
沙或作砂，为颗粒物质个一种。沙为自然出现，被分割得咾细小个岩石，渠个尺度为0.0625到2毫米。拉哥一尺度内个单一粒子称为沙粒。地质学下一个更小个尺度分类为泥，渠个颗粒大小由0.004到0.0625毫米。下一个较大个尺度分类则为砾，渠个颗粒大小为2到64毫米。
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