The layer of earth’s atmosphere that posses the highest density of all the atmospheric layer, which also contains most of the water vapor in the atmosphere is Troposphere.
The troposphere can be regarded as the lowest layer of Earth's atmosphere.
This troposphere can be described as the layer that occupied about 80% of the atmosphere, it is in this layer that most of the clouds are located.
Therefore, Troposphere serves as the layer of earth’s atmosphere that posses highest density compare to other layers of the atmosphere.
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