The sky becomes clear. Rain or snow begins to fall. Cold air is pushed to high altitudes. Warm air is pushed to ground level.
What most likely happens when a cold air mass comes into contact with a warm, moist air mass?

Options:
- The sky becomes clear.
- Rain or snow begins to fall.
- Cold air is pushed to high altitudes.
- Warm air is pushed to ground level.

Rain or snow begins to fall.