The Great Barrier Reef is the world's largest living structure. It is made up of around 2900 individual reefs and 900 islands. ... Climate change is perhaps the biggest threat to the Great Barrier Reef. Warmer ocean temperatures put stress on coral and lead to coral bleaching.
Some of the factors would be introduction of non native species, pollution, overgrazing, chemical agents and habitat loss
Covergent plate boundary occurs.
Answer:
The earth has 4 layers.
Explanation:
The crust, mantel, outer core, and inner core.
