The sulfur cycle

Acid rain is associated with large amounts of sulfur dioxide to the atmosphere by human sources.

simple animation of the sulfur cycle 

Coal is burned through the process of heating and then once burned releases SO2 into the atmosphere (shown above)

(The process in which sulfur moves through the atmosphere as hydrogen sulfide, sulfur dioxide, and sulfuric acid.)

An atmospheric cycle, hydrogen sulfide and sulfur dioxide released into the atmosphere from natural and non-natural sources. Acid deposition, sulfur returned to water and soil, taken up by plants, and animals. (Shown above)

This is a process where sulfur enters the atmosphere through a gaseous state

This is a simple model of the process of the sulfur cycle and how it is spread through out the earth.