What is the skeleton of corals composed of?

And they're razor sharp. Even sharks keep away from them.

I've seen many beautiful corals whilst diving. Many are dying off due to both bleaching, caused by a change in pH levels and coastal storms. I believe that a third of oceanic life lives on our around reefs.

RedSeaDiver69, I'm an avid snorkeler and have witnessed this as well. I go to Kona every other year and what I see breaks my heart.

In Australia we are lucky enough to have the Great Barrier Reef, which has many threats: bleaching from global warming and the crown of thorns starfish. There are wonderful people that are trying to regenerate, cultivate and restock areas affected. I just hope it is enough to save this wonder.

More correctly, of calcium carbonate.. such amazing animals that red algae form corals!

Saad, they must have wanted to ask ,which of the following elements is the greatest constituent of coral reefs

there are 3 types of coral reefs - fringing reefs, which are the most common and grow near the coastline around islands and continents. barrier reefs are like fringing reefs but separated by deeper, wide lagoons. Atoll is a ring shaped coral reef, that enclosed a lagoon partially or completely

RedSeaDiver69, the zooxanthelae that give coral their beautiful colors die off due to temp changes not pH. The warming of the oceans is the foundational cause of bleaching.

Saad, you beat me to it. calcium is the only credible answer of the 4, but still completely wrong.

Goblin, I believe that man is not in charge of the world, thank God!

Did you notice the range of temperatures they can live in? 70-85°F = not that much. This is why a global temperature change of +/- a few degrees is worrisome. But, that is if you believe in science and the future of of world.

Ive never went divingbefore ;-; thats beacause im very young ;-;

As of 2019, half the Great Barrier Reef is dead, due to climate change.😢

bad luck

RedSeaDiver69, It's people like you, that keep interfering with Coral reefs and destroying the fabric of those fabulous ecosystems. Keep your hands off.

Ok I kinda forgot the first part