Air is important for the planet because it contains the gases necessary to support plants, animals and other organisms. Additionally, the presence of an atmosphere keeps the Earth at a habitable temperature.Know More
The air on planet Earth is largely comprised of nitrogen and oxygen. Nitrogen is inert and does not affect most living organisms; however, all living animals require oxygen to survive. Plants require carbon dioxide to survive, which is also found in the earth’s atmosphere. Some bacteria require oxygen, but others are called anaerobic species, and they do not require oxygen. The balance of the various components of the atmosphere is very important to life on the planet.
If the world had no atmosphere, it would be very cold. Astronomers studying other planets know that planets without atmospheres have wildly fluctuating temperatures or they are cold all the time. The Earth’s air helps to moderate the temperature and make it a habitable place for living organisms.
The chemistry of the air surrounding the earth is very important. Currently, the world is warming as the ratio of carbon dioxide, methane and other gases increases. These chemicals are called greenhouse gases because they cause the planet to warm up, just as a greenhouse does.Learn more in Atmosphere
Air seems thinner at high altitudes because air pressure is lower, which allows individual air molecules to occupy a larger volume than air molecules do at low altitudes. This decreasing pressure with increasing altitude occurs because there are increasingly fewer air molecules exerting pressure on the next-lowest altitude.Full Answer >
Air at either pole moves in large-scale and persistent cyclones called the polar vortices. These vortices extend from the mid and upper-level troposphere in to the stratosphere. They enclose the polar highs, the regions of high atmospheric pressure around either pole, and lie in the wake of the polar fronts.Full Answer >
In dry air that does not contain pollution, the predominant gas is nitrogen, which makes up 78 percent of the atmosphere. The next two most voluminous gases are oxygen (21 percent) and argon (1 percent). Other gases appearing in trace amounts include carbon dioxide.Full Answer >
Dry air is composed primarily of nitrogen, oxygen, argon and carbon dioxide. Nitrogen and oxygen comprise approximately 99 percent of the atmosphere. The other gases are present in minute amounts, each of them equaling less than 1 percent.Full Answer >