Keys only form in tropical climates. The warm temperatures, coral beaches, and clear waters make them popular vacation spots. Places like the Florida Keys and the keys of Australia's Great Barrier Reef are visited by millions of tourists every year.

Photograph by Justin Sleder, My Shot
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key Encyclopedic Entry

Best For
5 - 12 and up

Earth science, Geography

Appropriate For

  • Educators
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  • Students

A key is a small, low island of ancient coral reef