| The mesosphere is the part of the atmosphere on top of the stratosphere, between 50 and 90 km above the surface. |
| There are no significant sources of heat in the mesosphere as there are in the stratosphere below and the thermosphere above. |
| After the peak, the stratopause descended further, the upper stratosphere warmed, and the lower mesosphere cooled. |
| Nacreous and Noctilucent clouds form not in the part of the atmosphere in which we live, but much higher up, in the stratosphere and mesosphere. |
| The asthenosphere, a less rigid region from 100 to 700 km beneath the surface, separates the lithosphere from the mesosphere. |
| Thermosphere, region of increasing temperature in Earth's atmosphere that is located above the mesosphere. |
