The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,600 kilometres (1,600 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi).The reef is located in the Coral Sea, off the coast of Queensland, Australia.
The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms. This reef structure is composed of and built by billions of tiny organisms, known as coral polyps.It supports a wide diversity of life and was selected as a World Heritage Site in 1981. CNN labeled it one of the seven natural wonders of the world.The Queensland National Trust named it a state icon of Queensland.
A large part of the reef is protected by the Great Barrier Reef Marine Park, which helps to limit the impact of human use, such as fishing and tourism. Other environmental pressures on the reef and its ecosystem include runoff, climate change accompanied by mass coral bleaching, and cyclic population outbreaks of the crown-of-thorns starfish. According to a study published on 1 October 2012 by the Proceedings of the National Academy of Sciences, the reef has lost more than half its coral cover since 1985.
The Great Barrier Reef has long been known to and used by the Aboriginal Australian and Torres Strait Islander peoples, and is an important part of local groups' cultures and spirituality. The reef is a very popular destination for tourists, especially in the Whitsunday Islands and Cairns regions. Tourism is an important economic activity for the region, generating $1 billion per year.
The Great Barrier Reef is a distinct feature of the East Australian Cordillera division. It includes the smaller Murray Islands. It reaches from Torres Strait (between Bramble Cay, its northernmost island, and the south coast of Papua New Guinea) in the north to the unnamed passage between Lady Elliot Island (its southernmost island) and Fraser Island in the south. Lady Elliot Island is located 1,915 km (1,190 mi) southeast of Bramble Cay as the crow flies.
Australia has moved northwards at a rate of 7 cm (2.8 in) per year, starting during the Cainozoic.Eastern Australia experienced a period of tectonic uplift, which moved the drainage divide in Queensland 400 km (250 mi) inland. Also during this time, Queensland experienced volcanoc eruptions leading to central and shield volcanoes and basalt flows.Some of these granitic outcrops have become high islands. After the Coral Sea Basin formed, coral reefs began to grow in the Basin, but until about 25 million years ago, northern
Queensland was still in temperate waters south of the tropics—too cool to support coral growth. Mermaid be found in the Great Barrier Reef
THE wreck of a ship that sank en route to the Top End 180 years ago may have been found.
A wreck found on the Great Barrier Reef off Cairns is "almost certainly" that of the historic HM Colonial Schooner Mermaid, wrecked on June 13, 1829.
Archaeologists from the Australian National Maritime Museum were scanning Flora Reef, 13km east of the Frankland Islands, when they found an anchor and other metal fittings.
They believe the discovery marks the final resting place of HMSC Mermaid, a government vessel that ran aground and broke up on a voyage from Sydney to northern Australia.
The 21m wooden vessel, built in India, was well known in Australian waters in the late 1820s, having circumnavigated the continent on a voyage of exploration under the command of Lieutenant Philip Parker King, RN.
Later, the Mermaid was directly involved with the establishment and supply of new colonies at Port Macquarie, Moreton Bay and Norfolk Island.
樓主: 鬍鬚子
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發表於 2012-11-5 00:43:46
