Summary:
- Clouds form when water vapor condenses around particles in the air.
- Three main types of clouds are cirrus, stratus, and cumulus.
- Thick clouds block some of the Sun’s rays during the day.
- At night, thick clouds prevent heat from radiating out into space.
- This keeps the surface warmer than it would be on a clear day.
- Clouds trap heat in the atmosphere at night.
- Clouds that form on the ground are called fog.
- clouds that form in the mid troposphere are called altocumulus.