1. Condensation: This is the process where water vapor in the air changes its state from a gas to a liquid. This happens when the air cools and can no longer hold as much water vapor. The water vapor then forms tiny droplets of water, which can then form clouds or precipitation.

2. Deposition: This is the process where water vapor changes directly from a gas to a solid, forming ice crystals. This occurs when temperatures are below freezing, and water vapor directly forms frost or snow.