Acid Rain. This is a research paper I did for my science fair project.

<Tab/>The term "acid rain" is used to describe rain, snow or fog that has been polluted by acid in the atmosphere during the water cycle. It is one of the most dangerous and widespread forms of pollution. <Tab/>Acid rain contributes to the damage of not only natural environments, but everyplace it lands upon. It harms bodies of water and many sensitive forest soils. In addition, …

…for ecosystems to recover from the effects of acid, even after emissions are reduced and the rain becomes normal again. For example, while the visibility might improve within days, and small chemical changes in streams improve within months, continually acidified lakes, streams, forests, and soils can take years to decades or even centuries (in the case of soils) to heal. <Tab/><Tab/> <Tab/>