Question

why does the stratosphere warm up as you go through it? absorption of ultraviolet radiation by ozone increased air pressure from more molecules a higher presence of water vapor there

Explanation:

The stratosphere warms with altitude because ozone in this layer absorbs ultraviolet radiation from the sun, converting it into heat energy. Air pressure actually decreases with altitude in the atmosphere, and water - vapor is more concentrated in the troposphere rather than the stratosphere.

Answer:

absorption of ultraviolet radiation by ozone