The famous Rock Islands of Palau, known for their unique umbrella-like shapes, are primarily made of which material?
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Palau's Rock Islands are made of ancient coral reefs that were slowly pushed upward by tectonic activity to form limestone islets. Over millennia, water and marine organisms eroded the bases of these islands, giving them their iconic mushroom or umbrella shapes. Today, this breathtaking archipelago is a UNESCO World Heritage site. Photo: Luka Peternel, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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