# What are the layer of gases that surround the Earth?

The layers of gas that surround the Earth are collectively referred to as the atmosphere. The atmosphere is subdivided into five layers: the troposphere, stratosphere, mesosphere, thermosphere and exosphere. The outermost layer is the exosphere, and the innermost layer is the troposphere.

The atmosphere is composed of approximately 79 percent oxygen and 21 percent oxygen, with small amounts of carbon dioxide and other trace gases present. The innermost layer, known as the troposphere, is where the atmosphere is the densest. This layer extends between four and 12 miles outward from the surface of the Earth, and it is where weather occurs.

Outside the troposphere is the stratosphere, which extends out to about 35 miles above the Earth's surface. The air is much lighter, and the temperature is below freezing. Because there is little turbulence in the stratosphere, planes often fly in this layer.

The mesosphere is less dense, extends 50 miles above the Earth's surface and reaches temperatures as low as -184 degrees Fahrenheit. Meteors often burn up in this layer. In the thermosphere, which extends to 400 miles above the Earth's surface, molecules are spread out and temperatures reach 3,600 degrees Fahrenheit. The outermost layer, the exosphere, extends to 6,200 miles above the Earth's surface. Gas molecules are few and far between there, and they easily escape into space.

Reference:
Q&A Related to "What are the layer of gases that surround the..."
 the atmosphere. The layer of gases that surrounds the earth is known as the atmosphere. The layer of gas surrounding the Earth is the Earth's atmosphere. http://wiki.answers.com/Q/What_layer_of_gases_surr...
 the atmosphere -cough- which is 79 % nitrogen, 21 & oxygen, and 1% argon http://answers.yahoo.com/question/index?qid=200901...
 The layers of gases surrounding earth are called the http://www.chacha.com/question/what-are-the-layers...
 Stratosphere . http://www.funtrivia.com/en/General/Blockbuster-14...
Top Related Searches
Explore this Topic
The atmosphere is the thin layer of gasses that surround the Earth. The atmosphere of Earth is around 300 miles thick. ...
A sheet of igneous rock that protrudes into the surrounding layers of rock is called a volcanic sill. It forms as a result of magma squeezing its way out between ...
The four realms of the earth are the atmosphere, which is the gaseous film that surrounds the Earth, the lithosphere that is the outermost concrete layer of the ...