Coral reef

A coral reef is a large underwater structure made of dead and living corals. In most healthy reefs, stony corals are predominant. They are built from colonial...

Great Barrier Reef is the world's largest coral reef. It is near the coast of Queensland, Australia. It is made up of nearly 2900 coral reefs and over 600...

one place make up a coral reef. Coral can also be used as jewellery. A drawing of one coral polyp A group of polyps A coral reef is made by millions of...

A reef is a rock, sandbar, or other feature below the water surface (less than 80 meters below low water). The best-known reefs are the coral reefs in...

The Belize Barrier Reef is a series of coral reefs. It goes along the coast of Belize, about 300 meters (980 ft) offshore in the north and 40 kilometers...

Kingman Reef is a coral reef in the North Pacific Ocean, owned by the United States. It is the farthest north of the Northern Line Islands. It is only...

Barrier Reef, as well as the biological, chemical and physical processes that influence them. Contemporary challenges such as climate change, coral bleaching...

Ningaloo Reef is one of the largest coral reefs in the world. It is off the North West Cape in Western Australia. It is about 260 km (162 mi) long. Ningaloo...

Coral bleaching occurs when stony corals turn white. Stony corals are simple animals that form large reefs. The animals live in a endosymbiotic relationship...

The WWF describe the Coral Sea as being one of the last complete tropical wilderness areas on earth. It has beautiful coral reefs with many different sea...

is white. The whitetip reef shark is widely distributed across the entire Indo-Pacific region, and is common along coral reefs, but is also found over...

It is made when a coral reef forms around an island that sinks over many years. In the end, the land is gone, and only the coral reef continues to grow...

called stony corals or hard corals, an order in the Cnidaria. It contains the polyps which build most coral reefs. Most of these corals are colonial....

The Coral Sea Islands (or Coral Sea Islands Territory) is a group of islands on the Great Barrier Reef, in the country of Australia. Some islands have...

Filippo Reef is a coral reef in the Pacific Ocean. It is located at 05°30′S 151°50′W / 5.500°S 151.833°W / -5.500; -151.833, 450 kilometres (280 mi)...

crown-of-thorns is well known for its destructive habits of eating coral, especially on the Great Barrier Reef, which is a World Heritage Site. Usually, when there...

pronunciation: /kiː/) is a small, low island made of mostly sand or coral and on top of a coral reef. The English word cay comes from the Spanish word cayo and...

Geographically is an island of coral origin. The Term applies whether the island was formed as a result of Sedimentation upon a Coral reef or the uplifting of those...

lagoon. This may be a pebble or shingle beach, sand bank, or perhaps a coral reef surrounding an atoll. An atoll is an oceanic island formed by a volcano...

atolls. These are ring-shaped islands made of a coral reef. But some are high islands with a coral reef around them. Traditionally in Micronesia, each...