what are useful effects of acid rains?

Answer 1

in the southwest, acid rain can counter the effects of alkali water, which aids agriculture.

Other than that its to be avoided/reduced..

Answer 2

Acid rain (or more accurately acid precipitation)[1] occurs when sulfur dioxide and nitrogen oxides are emitted into the atmosphere, undergo chemical transformations and are absorbed by water droplets in clouds. The droplets then fall to earth as rain, snow, or sleet. This can increase the acidity of the soil, and affect the chemical balance of lakes and streams.[2] The term "acid rain" is sometimes used more generally to include all forms of acid deposition - both wet deposition, where acidic gases and particles are removed by rain or other precipitation, and dry deposition removal of gases and particles to the Earth's surface in the absence of precipitation.[3]

Acid rain is defined as any type of precipitation with a pH that is unusually low.[4] Dissolved carbon dioxide dissociates to form weak carbonic acid giving a pH of approximately 5.6 at typical atmospheric concentrations of CO2.[5] Therefore a pH of <5.6 has sometimes been used as a definition of acid rain.[6] However, natural sources of acidity mean that in remote areas, rain has a pH which is between 4.5 and 5.6 with an average value of 5.0 and so rain with a pH <5 is a more appropriate definition
Adverse effects:
1.Acid rain has been shown to have adverse impacts on forests, freshwaters and soils as well as causing damage to buildings and having possible impacts on human health.

2.Surface Waters and Aquatic Animals.
3.Soils
4.Forests and other vegetation
5.Human health.
FOR MORE PL. VISIT:
http://en.wikipedia.org/wiki/Acid_rain

Answer 3

Certain cultivation fields are highly alkanine (due to the presence of carbonates). These fields are generally barren as plants cannot grow there. So, acid rains may be able to neutralize them and gain back the soil fretility.
Considering the bad effects of acid rain, this useful effect should not be much appreciated!!!!!!!

Answer 4

none but neutralizing the alkalinity in the soil

Answer 5

none. . .