Here's a breakdown:
* Earth's Structure: The Earth is made up of several layers: crust, upper mantle, lower mantle, outer core, and inner core.
* Lower Mantle: This layer is characterized by extremely high pressure and temperature, and it is primarily composed of silicate minerals like bridgmanite and ferropericlase.
* Depth: The lower mantle extends from the base of the upper mantle (around 660 km deep) to the top of the outer core (around 2890 km deep).
It's important to note that the exact composition of the lower mantle is still being studied, and there are varying hypotheses about its specific mineral make-up. However, the presence of bridgmanite and ferropericlase is widely accepted based on seismic wave analysis and laboratory experiments.
