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.
Australia's Great Barrier Reefâthe world's largest coral reefâis a unique marine ecosystem threatened by global warming. Damage to the reef could harm the region's biodiversity, tourism, and fisheries.1  The reef has suffered eight mass coral bleaching events since 1979, triggered by unusually high water temperatures.ustralia's Great Barrier Reefâthe world's largest coral reefâis a unique marine ecosystem threatened by global warming. Damage to the reef could harm the region's biodiversity, tourism, and fisheries. 1  The reef has suffered eight mass coral bleaching events since 1979, triggered by unusually high water temperatures.