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The stratosphere contains almost no water vapor.
troposphere
The Troposhere has the most water vapor then any other layer in the atmosphere.
Dust, water vapor etc are in troposphere. It is the closest layer.
Consuming oxygen that took months to diffuse to that level, adding water vapor to the atmosphere (water vapor depletes ozone), and heating the atmosphere a little bit, which lets more water vapor cross over into the ozone layer.
They are found in the troposphere. This is because both water vapor and carbon dioxide are cycled through the atmosphere and the earth. Therefore, their atmospheric components come directly from the earth/ocean which means they will be found in the layer of atmosphere closest to the ground.
Troposphere
Above the surface of liquid water is a layer of water vapor. It has pressure. The atmosphere also has pressure. It pushes against the water vapor. The water vapor pushes against the atmosphere. It is called vapor pressure. It is related to temperature. When the vapor pressure equals barometric pressure, water boils. Normally this occurs at 100C or 212F. If you reduce the barometric pressure, you can reduce the boiling point of water. So when the barometric pressure is lower, the water vapor above the water has an easier time mixing with the atmosphere. As it mixes with the atmosphere, it is replaced by vapor from the water. It evaporates.
the layer (of the earth) that contains the most water vapor is the troposphere
Because the water vapor get cooled by the time they reach the next layer atmosphere.
The troposphere, where all weather occurs, is the lowest and densest layer in the atmosphereIt is the lowest atmospheric layer. It is also the densest layer, containing 90% of the atmosphere's total mass. Almost all of the earth's carbon dioxide, water vapor.
vapor