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%。
结果1 题目What percentage of the Earth's atmosphere does nitrogen make up by volume? A. 21% B. 50% C. 78% D. 99% 相关知识点: 试题来源: 解析 C。原因:It makes up about 78% of the Earth's atmosphere by volume.。反馈 收藏 ...
Explain why too much nitrogen is bad for humans. what is the importance of nitrogen for living organisms? What is nitrogen fixation? What is nitrogen pollution? Explain why nitrogen is important. How do we use nitrogen in our biological processes? What is the importance of nitrogen fixation? W...
A是“如上所诉”的固定搭配,但不像1搂说的,as绝对不是做主语.该句子的主语是the atmosphere.B选项严格来讲在语法上是正确的.it作为形式主语,后面的the atmosphere 作为逻辑主语.但是相比较而言显得拖沓.况且As was mentioned above是习惯用法,约定俗成.C.what was mentioned above后面应该加was that,然后去掉...
What percentage of people in the U.S. have cell phones? What is an autotriploid? What is ''x'' in 1/6 + 1/12 = 1/x? If 2x + 25 = 35 what is x? What percent of the atmosphere is made of nitrogen? What is the percent compisition of each element in magnesium nitrite?
The thin layer of air surrounding the earth's surface is called atmosphere. It prevents a sudden increase in the earth's temperature and wards off the dangers of space.
Nitrogen Uses and Properties - Nitrogen is a diatomic gas with atomic number 7 and symbol N. Know the nitrogen atomic number, the atomic mass of nitrogen and atomic weight of nitrogen. Explore the Uses of Nitrogen.
Nitrogen is an odorless, tasteless, colorless nonmetallic chemical element which appears in great abundance in the Earth's atmosphere. It also appears in a number of other compounds, and is a vital component of life on Earth for many organisms. In addition to inhaling nitrogen with every breath...
One of the most common GHGs, CO2, is found in the Earth’s atmosphere and, along with nitrogen, oxygen, methane, and other gases, is part of the planet’s air. CO2 helps trap heat on Earth, like a greenhouse traps heat to grow tomatoes in cold climates. But too much of it can ...
The Earth's atmosphere is about 78 percent nitrogen, 21 percent oxygen and the rest is trace gases including argon, methane, nitrogen oxide and carbon dioxide (only 0.04 percent). The current average year-round temperature for our planet, according to NASA data, is 58.3 degrees F (which is...