Ozone is mainly found in the two regions of the atmosphere that are closest to the earth's surface. About 10 percent of the atmosphere's ozone is in the lowest-lying atmospheric region, the troposphere. This ozone is formed in a series of chemical reactions that involve the interaction of ...
环境问题分为两种，一种是传统意义的环境问题，这主要是指在工业革命以前人们对自然资源的不合理开发、利用所导致的环境破坏和资源浪费，即由于过分开垦荒地，滥伐林木、过度放牧，掠夺捕捞等而引起的水土流失、土地沙化、草原退化、水生生物资源日益减少，旱涝灾害频繁等等。例如，“美索不达米亚、希腊、小亚细...
However, this thin filter is enough to keep us safe and block most of the ultraviolet radiation coming from the sun. The smaller is the wavelength of ultraviolet light and can cause more damage to life, but is also more easily absorbed by the ozone layer. The problem lays at the places ...
Planet Earth is made up of four overlapping subsystems that contain all of world’s land masses, water sources, living organisms, and gases. These four subsystems are known as spheres. Geographers break down the Earth’s systems into four spheres that make up the world’s air (atmosphere),...
Which is the most important ore of extracted aluminium as discussed in chemistry? Group 4A contains two of the most important elements on earth. What are they, and why are they so important? What is the difference between mafic and felsic lava?
New sources of ozone-depleting chemicals were not a factor in the hole observed in the Arctic, said Peuch. " However, this is a reminder that one should not take the Montreal Protocol measures for granted, and that observations from the ground and from satellites are central to avoid a sit...
Scientists still do not understand all the complex problems of the desert; but there have been many ideas for saving the land. Saudi Arabia has planted 10 million trees to help keep the sand from taking over fertile areas. The Israelis are again using some of the water collection systems lef...
Is the ground-level ozone the same as stratospheric ozone? What are the benefits of stratospheric ozone (O 3 )? 1. Why are UV rays to be avoided? 2. Which refrigerant is the most harmful to stratospheric ozone? (a) R-12 (b) R-22 (c) R-134a (d) R-410...
New sources of ozone-depleting chemicals were not a factor in the hole observed in the Arctic, said Peuch. "However, this is a reminder that one should not take the Montreal Protocol measures for granted, and that observations from the ground and from satellites are central to avoid a situa...
The calculations also suggest that the title LTD processes can be important sources of highly vibrationally excited O2 in the middle atmosphere. Moreover, LTD is shown to offer an explanation for the fact that some down revision of the O+HO2 rate constant, or the ratio of the O+HO2 to ...