Acid rain 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. 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.[http://www.epa.gov/acidrain/

Acid rain is defined as any type of precipitation with a pH that is unusually low (Brimblecombe, 1996). Dissolved carbon dioxide dissociates to form weak carbonic acid giving a pH of approximately 5.6 at typical atmospheric concentrations of CO₂ (Seinfeld and Pandis, 1998). Therefore a pH of <5.6 has sometimes been used as a definition of acid rain 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 [http://www.enviroliteracy.org/article.php/2.html.

Acid rain accelerates weathering in carbonate rocks and accelerates building weathering. It also contributes to acidic rivers, streams, and damage to trees at high elevation. Efforts to combat this phenomenon are ongoing.

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the amount of time it takes to upload a video on YouTube is ridiculous!
welikepi (Joe Hernandez) Thu, 05 Nov 2009 08:28:32 -0000
the amount of time it takes to upload a video on YouTube is ridiculous!
#Confession - If I don't take at least 3 baths a day I cannot function properly
ICYUNVAngela (ICYUNVAngela) Thu, 05 Nov 2009 08:28:32 -0000
#Confession - If I don't take at least 3 baths a day I cannot function properly
"UPyD ficha a Vargas Llosa" Que poco sorprendente....
c0rvid0 (c0rvid0) Thu, 05 Nov 2009 08:28:32 -0000
"UPyD ficha a Vargas Llosa" Que poco sorprendente....
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JFernandez23 (Julian Fernandez) Thu, 05 Nov 2009 08:28:32 -0000
@henryb35 that's a hard choice personally I would say cavs and spurs!!
Bodovi koji život znače: Četvrto kolo skupine A Europske lige donosi treći okršaj Dinama i Ajaxa u Zagrebu u ma.. http://bit.ly/3rV9Ql
sport_hrvatska (Sport) Thu, 05 Nov 2009 08:28:32 -0000
Bodovi koji život znače: Četvrto kolo skupine A Europske lige donosi treći okršaj Dinama i Ajaxa u Zagrebu u ma.. http://bit.ly/3rV9Ql
#ilikeitwhen i wake up on a saturday morning and it's pouring rain and it's all dark :)
yahh_nasty (jasmine fripp) Thu, 05 Nov 2009 08:28:32 -0000
#ilikeitwhen i wake up on a saturday morning and it's pouring rain and it's all dark :)

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