Question

what is the name of the boundary between the mesosphere and the thermosphere? m. stratopause n. tropopause x. mesopause y. exobase

Explanation:

The mesopause is the boundary between the mesosphere and the thermosphere. The stratopause is between the stratosphere and mesosphere, the tropopause between the troposphere and stratosphere, and the exobase is the lower - boundary of the exosphere.

Answer:

X. Mesopause