Rains - it is the atmospheric precipitation that falls from clouds in the form of liquid drops with an average diameter from 0,5 mm. Annually 1 billion tons of water in the form of rains drops out on Earth. Today there are technologies that allow to create an artificial rain. Particles of an artificial drops from a plane directly into a Cumulus cloud. In a cloud carbon dioxide envelop water and falls like a snowflake, on the road heating up and turning into rain. It helps to fight against a drought or to dissipate clouds.