Contractors may have a hand in performing the construction labor as well. Contractors commonly work at construction sites. Although a contractor's main concern is hiring qualified subcontractors, she may also perform some of the construction work as well.
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 2,300 kilometres (1,400 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.he 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.
The coral reef off the coast of Queensland, Australia, in the Coral Sea is the Great Barrier Reef. It is the world's largest reef system, composed of over 2,900 individual â¦ reefs and stretches for over 1,400 miles over an area of about 133,000 square miles.