How+Acid+Rain+Is+Formed?

=__**How Acid Rain is Formed?**__=

(1) Acid rain is formed when sulfur dioxide and nitrous oxides are released into the atmosphere in large amounts. Exhaust from automobiles, power plants, and factory smokestacks fills the air with sulfur dioxide and nitrogen oxide gases. (2) Some of the gases become attached to particles in the air and fall to earth as dry deposition. (3) Great quantities of sulfur dioxide and nitrogen oxides mix with the moisture in clouds to form sulfuric acid. These reactions take hours, or even days during witch the polluted air can move hundreds of kilometer's even across water in sea winds and end up in other countries. (4) These acids fall, with the rest of the water in the clouds, as acid rain, or wet deposition. (5) The acids poison trees, crops, and other plants. (6) Sulfuric and nitric acids build up in rivers and lakes, killing fish and polluting the water.

When the mist or fog droplets condense and fall they will remove the pollutants from the air and make the acidity stronger. Even snow and hail can become acidic. Gases and particles that are not dissolved into water with a low pH can also be directly deposited into the soil, grass and leaves.

** __Natural Emissions-__ **
 Natural Emissions meaning the emissions from plants and the Earths crust. Such as volcanoes, wetlands and oceans. Acid deposits have been detected in Glacial Ice thousands of years old in very remote parts of the world.

** __Human Emissions-__ **
 The main emissions made by humans are electricity generation, factories, fuel combustions and vehicles. Another pollutant is coal-powerd power plants. These gases can be carried hundreds of kilometers in the atmosphere before they are converted to acids and deposited. In the olden days these factories had short fat funnels to let out the smoke, but this caused problems locally so they created new funnels that were longer and thinner but this caused the smoke to be dispersed into the atmosphere directly, causing widespread problems.