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In addition, CIA Careers has moved to a new location within the Web site Please use the links or the search form below to find the information you seek.The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity.Sulfur compounds such as hydrogen sulfide and sulfur dioxide (SO Earth's atmosphere Lower 4 layers of the atmosphere in 3 dimensions as seen diagonally from above the exobase.

The thermosphere is the second-highest layer of Earth's atmosphere.It extends from the mesopause (which separates it from the mesosphere) at an altitude of about 80 km (50 mi; 260,000 ft) up to the thermopause at an altitude range of 500–1000 km (310–620 mi; 1,600,000–3,300,000 ft).The exosphere is the outermost layer of Earth's atmosphere (i.e. It extends from the exobase, which is located at the top of the thermosphere at an altitude of about 700 km above sea level, to about 10,000 km (6,200 mi; 33,000,000 ft) where it merges into the solar wind.This layer is mainly composed of extremely low densities of hydrogen, helium and several heavier molecules including nitrogen, oxygen and carbon dioxide closer to the exobase.Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.

In general, air pressure and density decrease with altitude in the atmosphere.The atoms and molecules are so far apart that they can travel hundreds of kilometers without colliding with one another.Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space.among which are the greenhouse gases, principally carbon dioxide, methane, nitrous oxide, and ozone.Filtered air includes trace amounts of many other chemical compounds.However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.