User:Jordandeshane23/sandbox

where is the air densest?
Most people think that the air is the densest in the stratosphere, but the thing is that they might be correct but no! The real thing is that the air is the densest in the troposphere(The troposphere is the layer of the atmosphere in which nearly all life on earth exists. Tropo- means "turning." The troposphere is the layer where air"turns." It is where Earth's weather occurs. The troposphere contains about three-fourths of the atmosphere by weight and nearly all of the water vapor in the atmosphere. At the poles the troposphere reaches about 8 Km(5 mi)high. At the equator it reaches about 18 km(11 mi)high.

Why are Nitrogen and Oxygen so important to earth's atmosphere?
Nitrogen and Oxygen make up 99 percent of dry air. These two gases are necessary for life processes. Another gas necessary for life is carbon dioxide makes up only about 0.035 percent of dry air. The atmosphere also contains small amounts of several other gases.Water vapor ranges from almost none to about 4 percent of the air. Water vapor in the atmosphere is an important part of the water cycle.