AMart
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Planes are loaded with chemicals and they then release the chemicals at or near clouds they hope would produce rain. The chemicals help to produce much more rain in some cases.Cloud seeding?
The most common chemicals used for cloud seeding include silver iodide,[3] potassium iodide and dry ice (solid carbon dioxide). Liquid propane, which expands into a gas, has also been used. This can produce ice crystals at higher temperatures than silver iodide. After promising research, the use of hygroscopic materials, such as table salt, is becoming more popular.
Cloud seeding - Wikipedia
en.wikipedia.org