2. Coral bones are rare in ornamental stones and have high ornamental value. Many coral reefs formed by coral skeletons have become tourist attractions.
3. Coral reefs provide good living conditions for a variety of marine life, which is conducive to the protection of biodiversity and marine environment.
Coral reefs are rich in oil and natural gas resources. There are also coal, bauxite, manganese ore and phosphate rock in the sediments of coral reefs and lakes, and polymetallic stratabound deposits such as copper, lead and zinc are found in the coarse clastic rocks of reefs.
5. Coral bones can be used as raw materials for burning lime and cement, and various corals can be used as decorative handicrafts.
Extended data:
Coral image is like branches, bright and beautiful, and can be used as decorations. Gem-grade corals are red, pink and orange. Red is formed because coral absorbs about 1% iron oxide in seawater during its growth, and black is formed because it contains organic matter. It has glassy luster to waxy luster, opaque to translucent.
Coral can reproduce sexually or asexually. Sexual reproduction of coral has the advantages of strong reproduction, high genetic diversity and no damage to the mother coral.
Coral eggs and sperm are produced by gonads on the diaphragm and discharged into the sea through the mouth. Fertilization usually occurs in seawater and sometimes in the gastric circulation cavity. Usually fertilization only occurs between eggs and sperm of different individuals. The fertilized egg develops into a floating larva, which is covered with cilia and can swim. After a few days to weeks, it will be fixed on the solid surface and develop into a hydra.
It can also be propagated by budding, which will not be separated from the original hydra after budding. New buds keep forming and growing, so they breed into groups. When the new hydra grows and develops, the old hydra under it dies, but the skeleton remains in the population. Soft corals, gorgonian corals and blue corals live in groups.
References:
Baidu encyclopedia-coral skeleton
Baidu encyclopedia-coral reef