ClipArt ETC

The Coral Reefs ClipArt gallery offers 14 examples these underwater ecosystems held together by calcium carbonate structures secreted by corals.

"Atoll, a coral reef surrounding a pool of shallow water, usually called a lagoon. The atoll is formed by the building of a coral reef on a circular or nearly circular foundation. It is usually broken in one or more places so that the lagoon is connected with the surrounding waters." -Foster, 1921

Atoll

"Atoll, a coral reef surrounding a pool of shallow water, usually called a lagoon. The atoll is formed…

"Diagram illustrating Darwin's theory of the formation of Atolls." -Geikie, 1893

Atoll Formation

"Diagram illustrating Darwin's theory of the formation of Atolls." -Geikie, 1893

"Atolls. A coral island commonly consists of a narrow rim of reef, surrounding a lagoon." -Dana, 1880

Coral Island of Atoll

"Atolls. A coral island commonly consists of a narrow rim of reef, surrounding a lagoon." -Dana, 1880

Section of a barrier reef.

Barrier Section

Section of a barrier reef.

Formation of Coral Reeds, according to Darwin.

Coral

Formation of Coral Reeds, according to Darwin.

The reef forming the island is of limestone, derived form countless skeletons of minute polyps that once lived beneath the surface of the waters.

Coral Island

The reef forming the island is of limestone, derived form countless skeletons of minute polyps that…

This is an illustration of a relatively flat island, surrounded by coral-reefs.

Coral Island

This is an illustration of a relatively flat island, surrounded by coral-reefs.

The typical representation of coral reef on a topographical map.

Coral Reef

The typical representation of coral reef on a topographical map.

A section of an actual coral reef, showing the formation: two sides tall, above sea level with the middle lower and submerged.

Coral Reef Section

A section of an actual coral reef, showing the formation: two sides tall, above sea level with the middle…

"Diagram suggesting the development of a barrier reef and an atoll, successively, from a fringing reef, by sinking. 1, Fringing reef, formed in shallow water; 2, barrier reef, developed from fringing reef after subsidence; 3, the atoll which succeeds the barrier reef." -Salisbury, 1919

Barrier Reef Development

"Diagram suggesting the development of a barrier reef and an atoll, successively, from a fringing reef,…

A barrier reef is a coral reef that is far from land.

Barrier Reef

A barrier reef is a coral reef that is far from land.

Diagram illustrating the conversion of a fringing into a barrier reef by subsidence.

Barrier Reef

Diagram illustrating the conversion of a fringing into a barrier reef by subsidence.

Diagram illustrating the conversion of a barrier reef into an atoll.

Barrier Reef

Diagram illustrating the conversion of a barrier reef into an atoll.

A fringing reef is a coral reef that is close to land.

Fringing Reef

A fringing reef is a coral reef that is close to land.