Model for the composition of upper-mantle material proposed by Ringwood: one part basalt to three parts dunite (mainly olivine and pyroxene), partial melting of which gives basaltic magma.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。