Coral reef to form fringing reefs, and can eventually grow become a barrier reef. Where the bottom is rising, fringing reefs can grow around the coast, but coral raised above sea level dies. If the land subsides slowly, the fringing reefs keep pace by growing upwards on a base of older, dead coral, forming a barrier reef enclosing a lagoon between the reef and the land. A barrier reef can encircle an island, and once the island sinks below sea level a roughly circular atoll of growing coral continues to keep up with the sea level, forming a central lagoon. Barrier reefs
Two Water Mills with an Open Sluice book on Ruisdael's mills and water mills Slive calls it "Two Undershot Water Mills with an Open Sluice". The Getty Museum calls it "Two Watermills and an Open Sluice" on their website, object number 82.PA.18. Two Water Mills with an Open Sluice Two Water Mills with an Open Sluice, also known as Two Watermills and an Open Sluice, Two Undershot Water Mills with an Open Sluice is a 1653 painting by the Dutch Golden Age painter Jacob van Ruisdael. It is in the collection of the Getty Museum in Los Angeles. The painting shows two working undershot water mills, with