The mesosphere is primarily composed of gases, mostly nitrogen and oxygen, along with trace amounts of other gases like carbon dioxide and ozone.
It's important to differentiate between Earth's atmospheric layers and its internal structure:
* Atmosphere: Layers of gas surrounding the Earth.
* Interior: Layers of solid and molten rock within the Earth.
If you are interested in the composition of Earth's interior, the mesosphere is not relevant. The mantle, which lies below the Earth's crust, is primarily composed of silicate minerals, like olivine and pyroxene.