ازاي أصداف بحرية في غير مكانها كانت مفتاح قصة كوكب الأرضالمصادر1. https://www.amazon.com/Alfred-Wegener...2. https://www.amazon.com/Earth-Very-Sho...3. https://www.amazon.com/Essentials-Geo...4. https://www.amazon.com/Plate-Tectonic...5. https://www.open.edu/openlearn/scienc...6. https://www.open.edu/openlearn/scienc...Images Credits:Wikimedia Commons (Charles Lyell/ Lord Kelvin/ Henri Pecquerel/ Marie Curie / Pierre Curie/ Acasta Gneiss/ Wegener on a polar expedition/ Moon rock sample)Museum of the earth (800-million-years-old limestone/ Acasta Gneiss Rock)Britannica (Alfred Wegener)Lunar and Planetary Institute (Moon Rock Samples)

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