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The atmosphere is divided into five layers:
the troposphere is the first layer above the surface and contains half of the earths atmosphere.
the second layer is the stratosphere. air crafts fly in this layer.
the third layer is the mesosphere. meteors burn up in this layer.
the fourth layer is the thermosphere. 
the fifth layer is the exosphere.this is the upper limit of the atmosphere.
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Five layers protect the earth.They are the parts of atmosphere.First is troposphere.It is the nearest layer to the earth.Next is stratosphere,mesosphere,thermosphere,exosphere.
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