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 in crisis This mortal coral: new bleaching at the Great Barrier Reef â in pictures. Published: 5:01 PM. This mortal coral: new bleaching at the Great Barrier Reef â in pictures. Great Barrier Reef in crisis Great Barrier Reef at 'terminal stage': scientists despair at latest coral bleaching data. Published: 5:01 PM. Great Barrier Reef at 'terminal stage': scientists despair at latest coral bleaching data.