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ينقل التيار المائي في الأنهار مختلف العناصر الحثاثية من العالية إلى السافلة
مما يؤثر على شكل و قد هذه العناصر.
في موضوع منظم، بين كيفية هذا التأثير
ومعززا موضوعك برسوم و خطاطات واضحة
الـــــجـــــوابـــــ
مقدمة : ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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خاتمة
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