How clouds and seeding work

• Precipitation occurs when moist air rises to cooler altitudes, condensing the water out of the air into droplets. Once these droplets become heavy enough, often by coalescing around motes of dust or other particles, they fall out of the cloud as precipitation.
•  Cloud seeding is a technique which has been studied and practiced since the 1940’s. The science behind it is to drop ice forming materials, such as silver iodide or other materials, into clouds to produce precipitation.
• In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation include drizzle, rain, sleet, snow, graupel (smaller than hail but will look white and sometimes confused as hail) and hail.

 

(Images/videos taken from google/IE)