Airplanes do not release water into the atmosphere. Those cloudlike trails that you see following aircraft are called "contrails" and they are caused by the agitation of the air by the aircraft passing through it, causing water molecules suspended in the air to collide and join to create droplets.
The process of rain is actually quite simple. The water is absorbed into the atmosphere producing clouds and when these clouds get too heavy they release the water as rain.
The forming of water droplets and clouds in the atmosphere is referred to as condensation.
The process of which water is stored in the atmosphere as vapor, such as clouds & humidity.
Water in soil evaporates into a gas, then collects and turns dense forming clouds. Clouds are technically a part of the atmosphere.
Bodies of water are not part of the atmosphere, but water vapor and water and ice in clouds are.
No. The clouds on Neptune are caused by the gasses in the atmosphere.
Clouds are a natural part of the atmosphere, they consist of water vapour, which generally speaking isn't harmful.
water vapors combine together in the air. They form clouds.
In a nutshell, yes. They are not a layer of the atmosphere, but since a cloud is humidity in the atmosphere I would call it a component that makes up our atmosphere.
The reason is simple, water vapour is denser than methane meaning that the methane cloud layer forms above the 'water' clouds. Saturn also mostly has an atmosphere of Ammonia clouds.
Condensation
clouds