The earth has a geological age of 4.6 billion years since its birth. It has undergone many crustal movements, vicissitudes and metabolic renewal, and gradually bred and produced organic life. However, the emergence and development of life on earth are closely related to the role of the "umbrella" of the earth's atmospheric ozone layer.
Ozone (O3) has only one more oxygen atom than oxygen (O2), but their temperament is quite different. Ozone is a colorless gas with special odor. Usually very little in the air. Low altitude ozone comes from the action of lightning. The Resinification of pine forest can also form trace ozone. The fresh air in the forest after rain is the reason for the increase of ozone. A small amount of ozone is good for human body and can play the role of sterilization, disinfection and air purification. A large amount of ozone is concentrated in the middle of the atmospheric stratosphere, 25 ~ 35 kilometers away from the surface, where the ozone content is as high as about 10%, forming an ozone layer around the earth. Although the ozone content is too high, it will also kill the human body, but because a large amount of ozone is far away from the surface, it will not cause harm to human body and organisms. On the contrary, because the ozone layer absorbs almost more than 90% of ultraviolet rays, it plays an excellent protective barrier role, preventing all life on earth from the consequences of a large number of strong ultraviolet radiation.
[UV]
Ultraviolet light is the invisible part of the electromagnetic spectrum of sunlight. Sunlight refracted by glass prism can be divided into red, orange, yellow, green, cyan, blue and purple, which can be seen with the naked eye. Therefore, it is called "visible light" in the electromagnetic spectrum, while ultraviolet is different, which can only be observed and analyzed with instruments. It can kill white blood cells and endanger human and animal bodies. As its height increases, its radiation intensity also increases, so people who often live on the Tibetan Plateau often have their faces exposed to ultraviolet rays, which are red and black. In medicine, ultraviolet rays are used to sterilize patients, but protective measures must be taken for non diseased parts and operators to prevent killing human cells.
When people mention why life can be born on earth, they will think that it is difficult to find water, oxygen and suitable temperature on other planets - these living conditions. At this time, you should not forget the special function of ozone and its contribution to mankind. Nowadays, due to the large amount of carbon monoxide and nitric oxide emitted by industry, aviation and automobile, which escape in the sky, the ozone layer is destroyed and the content of ozone is reduced. This has attracted people's attention.
At present, many scientists are calling for measures to protect the ozone layer. Because to protect the ozone layer is to protect the whole ecological balance, which is the basis for human survival for generations
A big deal.