It is either a Ï bond or a lone pair on an atom of relatively high electron density in a molecule or ion, or a bond that must break during a reaction. An electron sink is an atom on a molecule or ion that can accept a new bond or lone pair of electrons.
Threats to the Reef. The Great Barrier Reef is one of the worldâs best managed reefs but, like other coral reefs, it faces threats such as: 1  Climate change. 2  Extreme weather.3  Declining water quality. 4  Coastal development. 5  Illegal fishing. 6  Crown-of-thorns starfish outbreaks. 7  Marine Debris.hreats to the Reef. The Great Barrier Reef is one of the worldâs best managed reefs but, like other coral reefs, it faces threats such as: 1  Climate change. 2  Extreme weather. 3  Declining water quality. 4  Coastal development. 5  Illegal fishing. 6  Crown-of-thorns starfish outbreaks.
Great Barrier Reef (UNESCO/TBS). The Great Barrier Reef is a site of remarkable variety and beauty on the north-east coast of Australia.It contains the worldâs largest collection of coral reefs, with 400 types of coral, 1,500 species of fish and 4,000 types of mollusc.reat Barrier Reef (UNESCO/TBS). The Great Barrier Reef is a site of remarkable variety and beauty on the north-east coast of Australia.