Coral Reef Section
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A section of an actual coral reef, showing the formation: two sides tall, above sea level with the middle lower and submerged.
Source
Charles R. Dryer Lessons in Physical Geography (New York, NY: American Book Company, 1901)
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1024×168, 39.7 KiB
640×105, 21.0 KiB
320×52, 7.2 KiB