Recall the process and terminology by watching an animation!
What are 5 things a city should do to improve conditions?
Watch this Nat Geo video to find if you are a 'typical' person!!
Corals are live animals made up of a colony of individual "polyps." Each polyp produces a hard skeleton in a cuplike shape for protection and support, and links its skeleton to those of the polyps around it. Thus, the individual skeletons of hundreds of coral polyps live as one coral colony.
Polyps are continually creating new skeleton at their base and sides. As they do this, they extend upward and outward from the coral colony center, living atop the old, dead skeleton they have created.
Coral reefs have existed on earth for about 450 million years. Australia's Great Barrier Reef is the largest in the world, stretching across 2,028 kilometers (1,260 miles).
This short animated film, narrated by actor/director/producer and Academy Award winner Sir David Attenborough, highlights the role forests can play in national development, a green economy and climate change.