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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch4_2.htmlTHE SOLAR SYSTEM CONTAINS HEAVY ELEMENTS, FORMED FROM AN EARLIER GENERATION OF STARS54a47ab4757a2eaf01000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch4_3.htmlTHE FORMATION OF THE PLANETS54a47ab4757a2eaf01000000
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http://digfir-published.macmillanusa.com/deu6e/deu6e_ch4_6.htmlSUMMARY OF KEY IDEAS54a47ab4757a2eaf01000000
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