What I think will happen: It will start raining.
Materials:
ice cube
2 clear plastic cups
hot water
1. Pour about an inch of hot water into the first cup. Put the other plastic cup on quickly and make sure the rims are touching!!!! The cups started to fog up because of the steam. This is called evaporation. The steam is called water vapor.
2. Put the ice cube on the top of both cups. That made the air at the top cold, and that made the water gather into tiny drops. This is called condensation.
3. The tiny drops of water get bigger by combining. Then they fall back to the bottom. This is called precipitation.
I had a lot of fun doing this experiment. I found out that steam can turn into droplets when they become clouds.