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The http://wiki.answers.com/earth/Atmosphere/overview.htmlis divided into five layers. It is thickest near the surface and thins out with height until it eventually merges with space.

1) The http://wiki.answers.com/earth/Atmosphere/troposphere.htmlis the first layer above the surface and contains half of the Earth's atmosphere. http://wiki.answers.com/earth/Atmosphere/weather.htmloccurs in this layer.

2) Many jet aircrafts fly in the http://wiki.answers.com/earth/Atmosphere/stratosphere.htmlbecause it is very stable. Also, the ozone layer absorbs harmful rays from the Sun.

3) Meteors or rock fragments burn up in the http://wiki.answers.com/earth/Atmosphere/mesosphere.html.

4) The http://wiki.answers.com/earth/Atmosphere/thermosphere.htmlis a layer with auroras. It is also where the space shuttle orbits.

5) The atmosphere merges into space in the extremely thin http://wiki.answers.com/earth/Atmosphere/exosphere.html. This is the upper limit of our atmosphere.

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Q: Earth can be divided into how many physical layers?
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