火成岩是三类岩石的主体,按其成因主要分为火成岩、沉积岩和变质岩三大类。在整个地壳中,火成岩大约占95%,沉积岩只有不足5%,其中变质岩最少。
trying to pick version control, continuous integration, and host for Flex + Ruby or Django smallish project. Question: