Gravity holds your feet down to the ground because the mass of the planet Earth exerts a gravitational pull on the mass of your body. Gravity is the pulling force that holds us all down onto the Earth's surface. In fact, everything has a gravitational pull towards everything else; even two people attract each other.
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http://www.wonderwhizkids.com/index.php/gravity
read more....
http://www.wonderwhizkids.com/index.php/gravity
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