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reef
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. Many reefs result from natural, abiotic (non-living) processes such as deposition of sand or wave erosion planing down rock outcrops. However, reefs such as the coral reefs of tropical waters are formed by biotic (living) processes, dominated by corals and coralline algae. Artificial reefs such as shipwrecks and other man-made underwater structures may occur intentionally or as the result of an accident, and are sometimes designed to increase the physical complexity of featureless sand bottoms to attract a more diverse range of organisms. Reefs are often quite near to the surface, but not all definitions require this.Earth's largest coral reef system is the Great Barrier Reef in Australia, at a length of over 2,300 kilometres (1,400 miles).
There's a company that turns dead bodies into an ocean reef
For those who romanticize a burial at sea, the company Eternal Reefs offers an innovative solution. It mixes the cremated remains of a person with concrete to create a "pearl" onto which loved ones can etch personal messages...
The world's largest man-made oyster reef was created in Maryland
Due to overfishing and disease, the oyster population in Maryland's Chesapeake Bay was seriously suffering. But thanks to dedicated work by scientists at the Horn Point Laboratory, the Army Corps, the National Oceanic and...