What is the structure of the Earth? For starters, it consists of several layers: the crust, the upper and lower mantle, and the core. The mantle makes up most of our planet’s volume—84%. The lower mantle represents 55% of the Earth’s volume—it is also hotter and denser than the upper mantle.
Click here for original story, Researchers discover previously unknown mineralogy of the deep Earth
Source: Phys.org