Q: What thin layer of air acts as a barrier to prevent cool air from mixing with warm air in the stratosphere?


Read this paragraph and choose the correct option from the provided answers:

At the top of the troposphere is a thin layer of air called the tropopause. You can see it in Figure above . This layer acts as a barrier. It prevents cool air in the troposphere from mixing with warm air in the stratosphere.

 Choices:

- methosphere

- endosphere

- liposphere

- tropopause


A:
tropopause