The atmosphere is mainly composed of nitrogen and oxygen. What percentage of the atmosphere is nitrogen? A. 21% B. 78% C. 99% D. 50% 相关知识点: 试题来源: 解析 B。解析:大气层主要由氮气和氧气组成,其中氮气约占 78%,氧气约占 21%。
What was Earth's early atmosphere like? What do the troposphere and the stratosphere have in common? What gases are released from a volcanic vent? Which layer of the atmosphere do we live in? What are the highest clouds in the atmosphere?
Jet lag. The feeling of being tired and slightly confused of the along planner eesp after traveling between place that have a time difference of the Harvard. Listen to the dialogue and pay attention to the background Information and the opening part of it then complaint. Their job, their co...
After the founding of the peoples Republic of China, many adapted traditional plays, new historical plays and modern plays with modern life themes have been warmly welcomed by the audience. The popular operas are Beijing opera, Kunqu Opera, Yue opera, Yu opera, Hunan opera, Yue opera, Qin op...
Titan’s atmosphere is similar to Earth’s both in the predominance of nitrogen gas and in surface pressure, which is about 1.5 bars, or 50 percent higher than sea-level pressure on Earth. However, its atmosphere is much colder, having a temperature at the surface of 94 kelvins (−290...
Air is a mixture of gases primarily nitrogen and oxygen essential for respiration, whereas the atmosphere is Earth's protective layer of gases, encompassing air, water vapor, and other components.
The chain began with the simple molecules found in the early cloud dusts, and culminated with the building blocks of life from which life on Earth first sprang. The chain leading to life.这条链条从早期云尘中发现的简单分子开始，到形成生命的基石，地球上的生命就是从这些基石开始萌芽的。一条生命...
1章练习题 Fill in the blanks. In the past century, language teaching and learning practice have been influenced by three different views of language: the view, the view and the view. 【答案】structural,functional,interactional 【解析】上世纪语言教学和语言学习受三种语言观的影响:结构主义,功能主义...
Now, one criticism of miller's experiments was um, was that, well, later on, it was shown that the composition of earth early atmosphere was a bit different from the mixture of gases that Miller used. But still, there have been experiments since then, which suggests that if you take ...
8.According to paragraph 3, what is the significance of the fact that the rocks of Earth's crust now contain an enormous amount of calcium carbonate? A. It explains why Oparin and Miller believed that Earth's early atmosphere was methane rich. ...