Sulfur is rarely found pure in the ground. It is an impurity which is removed from fossil fuels because it causes acid rain when fossil fuels are burned.

As well as being a strong acid, sulfuric acid is also a dehydrating agent, meaning it is very good at removing water from other substances. There are two examples you need to be aware of.

During the refining process, sulfur-containing compounds are removed from crude oil and natural gas, resulting in the generation of sulfur dioxide. This sulfur dioxide can be converted into sulfuric ...