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.
Threats to the Great Barrier Reef. While the Great Barrier Reef stands as a beautiful testament to the power of natural construction, in recent years there have emerged numerous threats to the existence of the reef that loom and make its future fairly uncertain.hreats to the Great Barrier Reef. While the Great Barrier Reef stands as a beautiful testament to the power of natural construction, in recent years there have emerged numerous threats to the existence of the reef that loom and make its future fairly uncertain.