Mesosfera

The video explains the mesosphere, which is the highest part of the atmosphere below the thermosphere, located between 50 and 85 km altitude, consisting of a uniform mixture of gases. It also describes the mesosphere as the lower part of Earth's mantle, situated between the outer core and the upper mantle.

What does the term 'mesosphere' also refer to?

What lies between the outer core and the upper mantle?