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.
The 2,300-kilometre Great Barrier Reef is the largest coral reef system in the world. Home to diverse marine life of the most vivid colours, experiencing the Reef is a life-changing adventure, whether you do it in luxury or on a budget.hat you can see on the Great Barrier Reef. Explore the world's largest coral reef, relax on the Whitsunday Islands and wonder at the dense rainforests of the world-heritage listed Wet Tropics. Top 10 Things to Do on the Great Barrier Reef... Top 10 Things to Do on the Great Barrier Reef.