Acid rain is simply rainfall that has become acidic in the atmosphere. Acid rain typically contains sulfur dioxide or other chemicals which can pollute Italy's lakes and forests. Acid rain forms as sulfur dioxide or nitrogen oxide is exposed to the air. These elements travel through the air, and as they go into the atmosphere, they blend with water or oxygen and make acid rain. It is clear that acid rain forms because of chemicals released. The chemicals come from urban and industrial uses, caused by humans. So, ultimately, Italy is held responsible for the acid rain that pollutes its lakes. They release chemicals into the air, and acid rain forms and comes back to pollute their lakes. The acid rain in the lakes will then cause acidification. Acidification is the lowering of soil and water because of acid rain and deposition usually by way of precipitation. Depending on where it is on the pH scale, acidification in a lake can kill the living organisms and destroy their habitats. As a final point, acid rain is one form of water pollution in Italy.