GREG DIMIJIAN / SCIENCE PHOTO LIBRARY GREG DIMIJIAN / SCIENCE PHOTO LIBRARY
Fingers of sand extend seaward from the shore of Grand Cayman Island in the Caribbean, encircling small islands of coral reef as the water gets deeper. Light reflected from the sandy bottom changes from blue-green in the shallows to deep blue near the reef dropoff. Taken from a light plane about 200 feet above the coast.
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