论文部分内容阅读
地球的构造是一个同心圈层构造,组成地球的物质按不同的密度在球心外围构成一层一层密度、温度、厚度不同的球状层次构成地球的同心圈层:
The structure of the earth is a concentric circle structure. The substances that make up the earth form a layer of concentric circles with different density, temperature and thickness in the outer periphery of the center of the sphere according to different densities.