Coral reef a protective area, or it may lie between the reef and the shore, and in this case is a flat, rocky area. Fish tend to prefer it when it is present. The reef lagoon is an entirely enclosed region, which creates an area less affected by wave action and often contains small reef patches. However, the "topography of coral reefs is constantly changing. Each reef is made up of irregular patches of algae, sessile invertebrates, and bare rock and sand. The size, shape and relative abundance of these patches changes from year to year in response to the various factors
Two Water Mills with an Open Sluice 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 the major one being half-timbered with a cob-facade construction, tie beams, and vertical plank gable. This is characteristic of the water mills in the Bentheim area in Germany, to where Ruisdael had travelled in the