Question

this portion of the stratosphere if known as the ______.
a. thermosphere
b. mesosphere
c. tropopause
d. ozone layer

Explanation:

To solve this, we analyze each option:

• A. Thermosphere: Part of the upper atmosphere, not stratosphere.
• B. Mesosphere: Above stratosphere, not part of it.
• C. Tropopause: Boundary between troposphere and stratosphere, not a portion of stratosphere.
• D. Ozone layer: Located in the stratosphere, absorbing UV radiation. This matches the "portion of the stratosphere" description.

Answer:

D. ozone layer