|  | | |
|
| |
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.
