سد الوادي
09-22-2013, 12:33 AM
المد الأحمر ظاهرة غريبة بسبب تراكم الطحالب المجهرية
على سطح المياه مع تكاثرها تحت تأثير عوامل معينة .
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على سطح المياه مع تكاثرها تحت تأثير عوامل معينة .
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