Acid Rain Students Site: What causes acid rain?

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Pond Background
*What is Acid Rain?*
*What Causes Acid Rain?*
*Why is Acid Rain Harmful?*
*What is Being Done?*
*What Can You Do?*
*
* * * ** * * *Games & Activities ** *Watch an Acid Rain Animation ** *Food
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 What Causes Acid Rain?

Factory emitting smoke*Sources of Acid Rain
*Acid rain is caused by a chemical reaction that begins when compounds like
sulfur dioxide and nitrogen oxides are released into the air. These
substances can rise very high into the atmosphere, where they mix and react
with water, oxygen, and other chemicals to form more acidic pollutants,
known as acid rain. Sulfur dioxide and nitrogen oxides dissolve very easily
in water and can be carried very far by the wind. As a result, the two
compounds can travel long distances where they become part of the rain,
sleet, snow, and fog that we experience on certain days.

Human activities are the main cause of acid rain. Over the past few
decades, humans have released so many different chemicals into the air that
they have changed the mix of gases in the atmosphere. Power plants release
the majority of sulfur dioxide and much of the nitrogen oxides when they
burn fossil fuels, such as coal, to produce electricity. In addition, the
exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur
dioxide into the air. These pollutants cause acid rain.

*Acid Rain is Caused by Reactions in the Environment*
Nature depends on balance, and although some rain is naturally acidic, with
a pH level of around 5.0, human activities have made it worse. Normal
precipitation—such as rain, sleet, or snow—reacts with alkaline
chemicals, or non-acidic materials, that can be


Source: www.epa.gov/acidrain/education/site_students/whatcauses.html


how is acid rain formed


Acid rain - Wikipedia, the free encyclopedia

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** Acid rain **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Acid rain (disambiguation).
Processes involved in acid deposition (note that only SO[2] and NO[x] play
a significant role in acid rain).

*Acid rain* is a rain or any other form of precipitation that is unusually
acidic, meaning that it possesses elevated levels of hydrogen ions (low
pH). It can have harmful effects on plants, aquatic animals, and
infrastructure. Acid rain is caused by emissions of sulfur dioxide and
nitrogen oxide, which react with the water molecules in the atmosphere to
produce acids. Governments have made efforts since the 1970s to reduce the
release of sulfur dioxide into the atmosphere with positive results.
Nitrogen oxides can also be produced naturally by lightning strikes and
sulfur dioxide is produced by volcanic eruptions. The chemicals in acid
rain can cause paint to peel, corrosion of steel structures such as
bridges, and erosion of stone statues.

*Contents*

· 1 Definition
· 2 History

· 2.1 History of acid rain in the United States

· 3 Emissions of chemicals leading to acidification

· 3.1 Natural phenomena
· 3.2 Human activity

· 4 Chemical processes

· 4.1 Gas phase chemistry
· 4.2 Chemistry in cloud droplets

· 5 Acid deposition

· 5.1 Wet deposition
· 5.2 Dry deposition

· 6 Adverse effects

· 6.1 Surface waters and aquatic animals
· 6.2 Soils
· 6.3 Forests and other vegetation
· 6.4 Human health effects
· 6.5 Other adverse effects

· 7 Affected areas
· 8 Prevention methods

· 8.1 Technical solutions
· 8.2 International treaties
· 8.3 Emissions trading

· 9 See also
· 10 References
·


Source: en.wikipedia.org/wiki/Acid_rain

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