2 The negative effects of the global warming phenomenon and how to overcome the global warming July 27, 2014 by Heba Soffar · Published July 27, 2014 · Last modified September 15, 2016
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0 Themochemistry science , Types of systems and law of conservation of energy November 20, 2016 by Heba Soffar · Published November 20, 2016 · Last modified November 26, 2016
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