Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > SULFUR COMPOUNDS > SULFUR OXIDES

Definition:
Sulfur oxides (SOx) can occur naturally from such sources as volcanoes,
sulfur springs and decaying organic matter, or from anthropogenic sources
such as fossil fuel combustion, brickworks, and spontaneous combustion in
coal mine spoil heaps. Sulfur oxides in the atmosphere are usually removed
by acid rain.  


Reference:
Porteous, A. 1996. Dictionary of Environmental Science and Technology, 2nd ed.
John Wiley and Sons, NY.