Chemistry

Question Analysis
This question involves identifying the phase change responsible for a specific natural phenomenon (cloud formation). The main focus is on applying phase change definitions to real-world atmospheric processes.

Key Concept Explanation
Clouds form when water vapor (gas) in the atmosphere cools and transitions into tiny liquid water droplets or ice crystals. The transition from gas to liquid is condensation, an exothermic process.
Sublimation (solid→gas) and deposition (gas→solid) do not form liquid droplets, while vaporization (liquid→gas) is the reverse process.

Step-by-Step Solution
1. Recall the composition of clouds: Tiny liquid water droplets or ice crystals from atmospheric water vapor.
2. Identify the phase transition from gas (water vapor) to liquid (water droplets): Condensation.
3. Match to ...