L ' atmosphere extends over our planet by enclosing it in a protective layer which is used to filter the sun's rays, reducing the temperature between day and night and keep the precious sun's heat is lost in the thick spazio.Essa is about 3000km, and is composed of 78% nitrogen (gas found in large amounts on our planet, but our body does not use), 21% oxygen (a gas that we breathe always, we could not live without it) and the remaining 1% is occupied carbon dioxide, water vapor and other gases. The atmosphere is divided into five layers: the troposphere, the stratosphere, mesosphere, ionosphere el'esosfera.
Information taken from the book, observe and experience
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