- Cloud seeding is a weather modification technique aimed at changing the amount or type of precipitation that falls from clouds. - It involves introducing substances into clouds to serve as cloud condensation or ice nuclei, altering microphysical processes within the cloud. - All the listed substances are commonly used cloud seeding agents: - 1. Silver iodide (AgI): Used to promote ice crystal formation in cold clouds. - 2. Potassium iodide (KI): Also used as an ice-nucleating agent. - 3. Dry ice (solid CO2): Causes the formation of ice crystals by cooling the air to temperatures below freezing; used in supercooled clouds. - 4. Sodium Chloride (NaCl): Used as a hygroscopic agent to promote condensation and droplet growth in warm clouds.