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They are completely different. An estuary is where a river joins the sea or, it is an outflow of freshwater into the ocean or sea. A coral reef is a strictly marine environment created by thousands of tiny organisms over thousands of years. It consists of the calcium skeletons of reef building organisms overlaid with living corals, anemones, clams, snails, fish etc etc.

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Some shallow-water coral reefs can grow in temperate waters where the temperatures are not as warm as the tropical waters off the coasts of Australia, the Bahamas, etc. but even these cannot withstand temperatures under 81 degrees Fahrenheit (with the exception of some in the Persian Gulf). Most corals die when they get too cold as they are extremely sensitive and do not have the capability to warm themselves up. Deep-water coral reefs have adapted to withstand the cold temperatures of deeper waters and thus do not face this problem.

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In theory....no, the hair algae doesnt kill corals, what does kill the coral is hair algae growing profusely next to it preventing the coral extending its polyps and getting sun light. Algae can cover the 'mat' of some species of coral such as xenia and star polyps also preventing the polyps from extending and getting nutrients and sunlight.

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Another possibility is that some conditions that favor algae may not favor the life of the coral such as temperature of the wate and pH of the water.

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anthozoa

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Colonies of coral take on many shapes and sizes. No two look the same. Some resemble plants, some resemble brains, some are spiraling while others are flat like a table top. All of these make up a coral reef. There are many different types of coral reef as well. There is atoll reef, barrier reef, fringing reef, table reef, apron reef, bank reef, patch reef and others. Each of these different types of coral reef grows in a different environment. For more information about the specific shapes associated with the reef types listed above, see the related link.

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Artificial Reefs were first used a few thousand years ago by the Persians, although they were used in times of war, mainly to block harbours.

The Japanese were the first to use them in the context of aquaculture back in the 17th century to grow kelp.

Since the 1970's the construction of artificial reefs has really taken off.

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Biodiversity would collapse because coral is the main food source for countless numbers of marine life and if coral died, the marine life that thrives on coral would die as well. This would cause the fish and other sea animals that feed on the marine life that feeds on coral to die and the effect would simply snowball. It would cause the Earth a major impact and the cost of this would be very high to us.

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Coral reefs are incredibly sensitive and thus much more open to disease and damage/destruction. Scientists, biologists, etc. are attempting to protect them by limiting what types and how much fishing occurs on a coral reef, limiting how much biotourism is allowed as some human diseases affect coral reefs as well as well as promoting the lessening of pollution and greenhouse gases. There are also laws in place to help protect the coral reefs and some coral reefs are protected areas much in the way national parks are often protected areas.

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Yes plankton live everywhere where there is water.

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Octopus are preyed upon by sharks, stingrays and other large, predatory fish.

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Yes. The animals that inhabit the coral reef have life cycles that they must go through and so all of them die at some point. This includes fish (including sharks), sea snakes, eels, sea slugs, sea anemones, starfish, clams, sea turtles, squid and other such creatures.

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Well Firstly, the fish hide in the coral reefs to get away from sharks. However, the sharks know where the fish are and so visit the Reefs. When the sharks try to nose into the coral they find that they're too big to fit into it. But still, they persist and so end up squashing the coral.

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I had asked the same thing before but then I figured it out. Out of a flatworm, sponge, coral, or crab, the complex invertebrate is a crab.

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They need sunlight, and lots of it, because the way that they survive is the algae living inside of them, so they water needs to be shallow. It needs to be warm because algae cannot grow in cold environments.

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Dynamite fishing, coral hunting, pollution, and over-fishing just to name a few.

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Usually a pastel like red color.

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• water pollution
• oil spills
• water temperature rising
• dead zones in the oceans
• boats/people damage reef

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It is made up of coral.

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Considered one of the great natural wonders of the world, the Great Barrier Reef sits off the northeast coast of Australia. It is located in the Coral Sea and extends for a length of around 2300 km down the coast of the eastern state of Queensland. It is actually a series of reefs and atolls, with its northern end just south of Papua New Guinea. It is the largest coral reef in the world. Australia has almost one-fifth of the world's reef area most of which is located in the Great Barrier Reef. It is the largest structure on earth created by living things, hosts millions of ocean-living creatures, and can be seen from space.

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yes because it obtain its food by its own

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it is because the type of organism that makes coral reef colonies , can not survive in great Britain's cold waters. It can only survive in warmer waters and would die in England's frigid water

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The Tubataha reef is in the Sulu Sea in the western Philippines.

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Yes, and you can read more about the coral reefs found off Antarctica's coast, below.