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氧不仅是地球上分布最广、含量最多的元素,同时又是地球上所有生命赖以生存的物质。数10亿年来,正是氧与二氧化碳互为补充的神奇循环,造就了万物繁荣的地球。氧气(O_2)主要分布在地球表面附近大气中,并随着海拔高度增高而递减。据科学家研究得知,早期地球大气中并没有氧气,直到25亿年前,一种原始的海洋生物绿藻大量繁殖起来后才有了变化。绿藻能利用水进行光合作用,把水分解成为电子、质子和氧气。现在地球大气中的氧气含量,很稳定地维持在
Oxygen is not only the most widely distributed and most abundant element on the planet, but also a substance upon which all life on earth depends. For billions of years, it is the magical cycle of oxygen and carbon dioxide complementing each other, creating a prosperous planet for all things. Oxygen (O 2) is mainly distributed in the atmosphere near the Earth’s surface and decreases as the altitude increases. According to scientists’ research, there was no oxygen in the early Earth’s atmosphere. It was not until after 2.5 billion years ago that the original marine life green algae multiply. Green algae can use water for photosynthesis, the water into electrons, protons and oxygen. The oxygen content of Earth’s atmosphere is now very stable