Between which atmospheric layers is the mesopause located, a region where temperature remains nearly constant?

Between which atmospheric layers is the mesopause located, a region where temperature remains nearly constant?

• A. Mesopause
• B. Tropopause
• C. Stratopause
• D. Ionosphere

Answer: (A)

The key idea is the boundary where the character of temperature with height changes. The mesopause sits at the top of the mesosphere, marking the boundary with the thermosphere above. In this region, the temperature stops decreasing as you go higher and remains nearly constant across the layer, effectively separating the mesosphere from the thermosphere. The other options correspond to different boundaries: tropopause is between the troposphere and stratosphere, stratopause is between the stratosphere and mesosphere, and the ionosphere is a high-altitude region within the upper atmosphere, not a boundary between adjacent layers. So the mesopause is the boundary between the mesosphere and the thermosphere.

The key idea is the boundary where the character of temperature with height changes. The mesopause sits at the top of the mesosphere, marking the boundary with the thermosphere above. In this region, the temperature stops decreasing as you go higher and remains nearly constant across the layer, effectively separating the mesosphere from the thermosphere. The other options correspond to different boundaries: tropopause is between the troposphere and stratosphere, stratopause is between the stratosphere and mesosphere, and the ionosphere is a high-altitude region within the upper atmosphere, not a boundary between adjacent layers. So the mesopause is the boundary between the mesosphere and the thermosphere.