The atmosphere is formed by steam of water and carbon dioxide, between other gases which are transparent to the radiaton of the Sun.Nevertheless, when this radiation is emitted of return from the soil towards the exterior in the shape of heat, it is reflected partly again towards the Earth by these gases.The atmosphere behaves as a crystal, which supports the heat in his interior and helps to stabilize during millionyears the everage temperature of the planet (15ºC). If the greenhouse effect didn´t exist, the temperature of the Earth to fall some 30ºC.
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