Coral Reef - Images Series Author:Michael George Underneath the beautifully clear waters of tropical seas are complex mazes of ledges, boulders, crevices and caves. Brilliant in color and teeming with life, these cities under the sea can become as large as a mountain. These formations are the world's fascinating coral reefs. Reefs are not made of rock or earth, like the continents. Instead, th... more »e huge structures are made up of tiny animals called coral polyps. How do these small creatures, no bigger than a fingernail, creat enormous reefs? Within Coral Reef, you'll learn all about this remarkable process. Through magnificent photographs you'll be introduced to the exotic plants and animals thay inhabit reefs -- from gorgonians and sea anemones to cave-dwelling octopuses and nurse sharks. Read on, and explore the unique underwater world of the coral reef.« less