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Title
Fishes swimming in the sea. #167072154
Description
A reef is a bar of rock, sand, coral or similar material, lying beneath the surface of water. Many reefs result from natural, abiotic processesââ¬âdeposition of sand, wave erosion planing down rock outcrops, etc.ââ¬âbut the best known reefs are the coral reefs of tropical waters developed through biotic processes dominated by corals and coralline algae.