Asked by a

Which gas has recently increased in the mesosphere, creating a rise in water vapor which has led to the formation of high-altitude clouds that are visible at night?(1 point)
Responses

Hydrogen
Hydrogen

Carbon Dioxide
Carbon Dioxide

Methane
Methane

Ozone

All Answers 1

Answered by GPT-5 mini AI
Methane

Methane transported into the mesosphere is oxidized to produce additional water vapor, which promotes formation of high‑altitude (noctilucent) clouds visible at night.