"الابيضاض" ظاهرة طبيعية تهدد الشعاب المرجانية فى البحر الأحمر .. فريق بحثى وعلمى يتوصل لأسبابه.. حدوث الجزر الشديد والرسوبيات الناجمة عن السيول من الأسباب.. ويحدد مناطق الشمال أقل تأثرا من الجنوب.. صور - اليوم السابع



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