From ancient times to the present, people's praise for the sea never stopped, and has the most true longing for it. Most people have been exposed to sea water, and they also know that the sea water is salty. So why is sea water salty?

There are two sources of the earth's water bodies: one is because the asteroids and meteorites are constantly hitting the earth; the other is from the earth itself. The early meteorite impact and oversized volcanic eruption of the earth are the key to the formation of the ocean in the later stage.

A long time ago, in the explosion of the universe, a lot of dust was generated on the surface of the earth. This caused the entire atmosphere to be shrouded and the sun could not illuminate the earth. The temperature on the earth is very low for a long time.

Therefore, after a long time, the earth is covered by ice. After hundreds of years, after the dust on the atmosphere gradually fell, the earth had sunlight. The melting of the ice layer forms a large amount of water, and the primitive ocean is slowly formed.

Sea water is the "hometown" of salt, which is traceable. In the early days of the earth formation, all life objects were slowly germinated. In the basis of survival on various life, the ocean provides an excellent breeding ground for the growth of life.

During the long geological period, the surface water that has just begun is fresh water. Later, because the salt in the rocks on the surface was constantly washed by the water flow, the water contained salt. The water containing salt is constantly forming many rivers and eventually remitted into the sea.

For a long time, the more salt accumulates, the sea water naturally becomes salty. After billions of years of cycle, the current salt content of seawater is about 35%.

The green seawater is actually the phenomenon of seawater's ability to absorb light.

Because the color of the seawater is mainly caused by the absorption, reflection and scattering of the light. The sun is composed of red, orange, yellow, green, green, blue, and purple. From the red light to the purple light, the wavelength is gradually shorter.

Among them, the wavelength of red light, orange light, and yellow light is very long, and the most easily absorbed by water molecules. The blue light wavelength is short, and when encountering pure sea water, it is most likely to be scattered by water molecules. In the shallow seas, the light wavelength light is scattered less, and it appears green.

Due to the limited land resources, in the current situation of increasing shortage and over-development, people have gradually seek new development space. The significance of the ocean to human survival and development cannot be underestimated.

Therefore, countries need to find new economic development space in the marine areas to promote the sustainable development of society.

In recent years marine tourism has gradually become one of the important tourism resources other than landscape and humanistic tourism and Because of its unique significance marine tourism industry has continued to become the focus of modern tourists.