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A wave breaks over a coral reef in the Red Sea. Coral reefs form when colonies of tropical marine plants and animals with limestone skeletons rise atop earlier generations.</p>
Red Sea Reef
A wave breaks over a coral reef in the Red Sea. Coral reefs form when colonies of tropical marine plants and animals with limestone skeletons rise atop earlier generations.
Underwater Landscapes
See photos of underwater landscapes and download free desktop wallpapers, from National Geographic.
