Coral reef
Coral reef
Outcrop of rock in the sea formed by the growth and deposit of stony coral skeletons.
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Readers' pathsAug 2026 – Oct 2026
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Coral
Marine invertebrates of the subphylum Anthozoa.
17%
Great Barrier Reef
Coral reef system in Queensland, Australia.
7%
Polyp (zoology)
One of two forms found in the phylum Cnidaria (zoology).
4.8%
Scleractinia
Order of Hexacorallia which produce a massive stony skeleton.
4.6%
Deep-water coral
Marine invertebrates.
3.3%
Sponge
Animals of the phylum Porifera.
3.2%
Atoll
Ring-shaped coral reef.
2.8%
Fish
Gill-bearing non-tetrapod aquatic vertebrates.
2.7%
Jellyfish
Soft-bodied, aquatic invertebrates.
2.7%
Ecosystem
Community of living organisms together with the nonliving components of their environment.
2.6%
Readers come from
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Great Barrier Reef
Coral reef system in Queensland, Australia.
16%
Coral
Marine invertebrates of the subphylum Anthozoa.
11%
Atoll
Ring-shaped coral reef.
4.4%
Reef
Submerged ridge of rock, coral or other material.
4.2%
Ecosystem
Community of living organisms together with the nonliving components of their environment.
2.6%
Fringing reef
Type of coral reef.
2.5%
Cay
Small island formed on the surface of a coral reef.
2.2%
Life
Matter with biological processes.
2.2%
Bikini Atoll
Coral atoll in the Marshall Islands.
2.2%
Coral island
Island formed from coral and associated material.
2.1%