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Earth's Atmosphere: Role, Structure, Layer, Permanent gases, Composition, Importance



The atmosphere of the Earth, Structure, Composition, Layers, Essential Parts, Importance 

The atmosphere can be divided into five layers according to the diversity of temperature and density. They are:

Troposphere, Stratosphere, Mesosphere, Thermosphere (Ionosphere), Exosphere.

The composition of the atmosphere

The atmosphere is composed of a mix of several different gases in differing amounts. The permanent gases whose percentages do not change from day to day are nitrogen, oxygen, and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21%, and argon 0.9%.

Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of one percent of the atmosphere.

Water vapor is unique in that its concentration varies from 0-4% of the atmosphere depending on where you are and what time of the day it is.

In the cold, dry artic regions water vapor usually accounts for less than 1% of the atmosphere, while in humid, tropical regions water vapor can account for almost 4% of the atmosphere. 

The earth's atmosphere is the environment for most of its biological activity and exerts a considerable influence on the ocean and lake environment. Weather consists of the day-to-day fluctuations of environmental variables and includes the motion of wind and formation of weather systems such as hurricanes.


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