A distinctive mushroom cloud blossoms over a nuclear explosion at Bikini Atoll in the Pacific Ocean. The U.S. government tested 20 nuclear weapons here between 1946 and 1958.

Photograph courtesy U.S. Navy

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atoll
atoll Encyclopedic Entry

Best For
4 - 12 and up

Subjects
Geography, Social Studies, Science

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Encyclopedic entry. An atoll is a ring-shaped coral reef, island, or series of islets. The atoll surrounds a body of water called a lagoon.