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ما هي العناصر الطبيعية الاهم المكونة للكون؟

الكيمياء الأرض العلوم
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Question added by Hamza Chabli
Date Posted: 2016/01/30
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naif almalki

هيدروجين , كربون , اوكسجين , نيتروجين

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