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L'atmosfera


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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Il pianeta terra


in this post deepen the planet earth from 'external:
planet earth up to 500 was considered the center of the' universe, only later thanks to some scholars (Newton, Galileo, Kleplero ) it was discovered that the earth revolves around the sun and on itself. Today we also know that it is the third closest planet to the sun which allows it to be not too cold nor too hot.
seen from space the earth looks round, but by measuring the polar and equatorial radius is discovered that the earth and flattened at the poles and bulging in the vicinity of 'equator.
The earth has elements that allow esserei living to live there. Among these factors are the atmosphere and hydrosphere.
atmosphere, and a kind of envelope of gas that stretches around the earth, is used to filter the sunlight and prevent the spread too quickly in space.
The hydrosphere is the water instead of on our planet, it represents about 71% of the earth's surface, while the rest is occupied by the lithosphere and that land.

revised information from the website www.wikipedia.org and
observe and experience the book and the photo taken from the website www.wikipedia.org