ما هي المادة التي يتكون منها اللؤلؤ والصدف؟

12 ديسمبر 2012

ما هي المادة التي يتكون منها اللؤلؤ والصدف؟

يتكون اللؤلؤ والصدف من افراز الحيوان داخل الصدفة من مادة كربونات الكالسيوم.

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