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砂子的主要成份是二氧化矽,二氧化矽的密度是2.65g/cm3,砂子由於有空隙比這個密度要小一些.各種石頭的密度都不一樣的,部分石頭比重如下:花崗石:2.63~3.3,正長岩:2.3.3,閃長岩:2.3.3,斑岩:2.8,安山岩:2.3.3,輝綠岩…
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