Dictionary entry overview: What does accretion mean? â¢ ACCRETION (noun) The noun ACCRETION has 6 senses: 1. an increase by natural growth or addition 2. something contributing to growth or increase 3. (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases 4.
Great Barrier Reef. 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.
Image courtesy of the Great Barrier Reef Marine Park Authority. The Great Barrier Reef is the only living organic collective visible from Earth's orbit. The Great Barrier Reef, off the east coast of Australia, is one of the wonders of the natural world-it is the world's largest coral reef ecosystem.It was declared a World Heritage area in 1981 and added to the National Heritage List in 2007.he Great Barrier Reef area abounds with wildlife, including dugong and green turtles, varieties of dolphins and whales, more than 1500 species of fish, 4000 types of mollusc and more than 200 species of bird life.