The only planet that supports life (as per the present knowledge of humans) is the Earth. The life supporting zone of the Earth is very small compared to the vast Universe. It is from the bottom of the ocean bed to the top of the highest mountain. Less than 0.5% is of the space available for human habituation, as we can’t live under extreme hot or cold conditions.
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http://www.wonderwhizkids.com/index.php/planet-earth
read more.....
http://www.wonderwhizkids.com/index.php/planet-earth
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