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Earthlearningidea - http://www.earthlearningidea.com/ Rocks to eat? How we get the elements we need to stay healthy We are alive and like other living things, we need
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Document Date: 2014-11-17 15:10:58
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Earthlearningidea - http://www.earthlearningidea.com/ Rocks to eat? How we get the elements we need to stay healthy We are alive and like other living things, we need