 |  | | |
| | |
Element | |
Element Abundances in the Earth's AtmosphereClick | | Notes | ||
|---|---|---|---|---|---|---|
| |
| |||||
Nitrogen |
| N2 | ||||
Oxygen |
| O2 | ||||
Water |
| H2O (highly variable) | ||||
Argon |
| |||||
Carbon Dioxide |
| CO2 | ||||
Neon |
| |||||
Helium |
| |||||
Methane |
| CH4 | ||||
Krypton |
| |||||
Hydrogen |
|
H2 | ||||
Reference (Click the 
next to a value above to see complete citation information for that entry)
National Aeronautics and Space Administration (NASA). Earth Fact Sheet. http://
. Accessed on September 18, 2011.
