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2015-09-24T21:54:03+05:30

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When meteors enter the atmosphere at very high speed, the friction force acting on them due to air is very high. It generated very high amount of heat which burns the meteors. 
It starts burning shortly after entering the atmosphere. If it is large in size, it might not burn completely when it reaches earth. But in general, the size is not very big and they are burnt completely before they reach earth surface.
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