See ionosphere.
The lower mantle, from a depth of about 720 km to the core boundary at 2886 km depth, in which the seismic velocities increase as a function of adiabatic compression.
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。