Even though you are getting closer to the sun as you ascend into the troposphere, why does the temperature drop? the lower atmosphere is heated by the ground
warm air stays below cold air
the troposphere is a stable layer
ozone blocks the sunlight

hope it's the right warm air stays below cold air

Explanation:

warm air stays below cold air:the troposphere is heated from the ground, so temperature decreases with altitude. Because warm air rises and cool air sinks.

the lower atmosphere is heated by the ground:*the troposphere is heated from the ground*

the troposphere is a stable layer:*the troposphere is unstable*

ozone blocks the sunlight:*in the stratosphere, temperature increases with altitude.The stratosphere contains the ozone layer, which protects the planet from the Sun’s harmful UV radiation*