Question

which layer is the third layer of the atmosphere? exosphere ozone mesosphere stratopause

Explanation:

The atmosphere has several layers. The troposphere is the lowest layer. Above it is the stratosphere. The third layer is the mesosphere. The exosphere is the outermost layer. The ozone layer is a part of the stratosphere (it contains a high concentration of ozone gas). The stratopause is the boundary between the stratosphere and the mesosphere, not a layer itself.

Answer:

mesosphere