1. The reason the ocean is blue
Sunlight is made up of seven types of visible light: red, orange, yellow, green, cyan, blue, and violet. These seven types of light have different wavelengths, and seawater at different depths will absorb light beams of different wavelengths.
After red, orange, yellow and other light beams with longer wavelengths are emitted into sea water, they are gradually absorbed, while blue and cyan light beams with shorter wavelengths are emitted into and encounter seawater. molecules or other tiny particles, floating bodies suspended in the ocean, scatter and reflect in all directions .
In particular, seawater absorbs less blue light and reflects it more. The deeper you go, the more blue light is refracted towardsthe water surface. Therefore, the sea water we see in the ocean is blue. color.
2. Minerals in the ocean
Dilute manganese nodules, oil, seafloor hydrothermal mineral deposits, nickel, copper, cobalt and salt.
3. Marine animals
Lighting zone: (from the water surface to 200 meters underwater) where a large number of planktonic creatures, algae and coral reefs live, except fish and marine mammals. . , there are also a large number of marine invertebrates, such as jellyfish, cephalopods, etc., as well as marine reptiles, seabirds, etc.
Low light zone: (200 meters 1000 meters underwater) Most organisms have large eyes and light-emitting organs, and some animals hide in dimly lit areas during the day and move into shallow water to forage for food at night.
Deep water zone: (below 1,000 meters underwater), the sun's rays never shine here, it is dark all year round, and there is little submerged food. Few animals can survive in the deep sea.
Detailed information:
Classification of marine animals:
1 , divided by lifestyle
Marine animals mainly include three ecological types: marine zooplankton, swimming marine animals, and benthic marine animals.
2. Classification system
There are dozens of categories of marine animals, which can be divided into three broad categories: marine invertebrates, marine protozoa, and marine vertebrates.
Marine invertebrates represent the vast majority of marine animals and include the most diverse categories. The main ones are protozoa, sponges, coelenterates, platyhelminths,nematozoa and brachiates, echinoderms and hemichordates, etc.
Marine protochordates are animals living in the ocean between vertebrates and invertebrates, including urochordates and cephalochordates.
Marine vertebrates, including fish, reptiles, birds and mammals that depend on the ocean.
Reference documents:
Baidu-Ocean Encyclopedia
Baidu Encyclopedia-Marine Animals