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ما هو ثقب الأوزون؟

ⴷⵔⵉⵙⵙ ⵃⴰⴼⵙⴰ الآرض 26 يناير 2013

ما هو ثقب الأوزون؟ هو فراغ في طبقة غاز الأوزون الموجودة في الغلاف الجوي والتي من وظيفتها حماية الأرض من الأشعة الض...

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Keep going الآرض 06 ديسمبر 2012

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