Page 140 - Science Course 1 (Book 2)
P. 140
Mo9-L6a: What is Air Pollution?
Nonpoint-source pollution is pollution that comes from a wide-spread area, such as a large city.
Some bacteria found in swamps and
marshes are examples of natural
sources of nonpoint-source pollution.
Key Concept
What is Air Pollution?
Compare point-source and nonpoint-source pollution.
Causes and Effects of Air Pollution
Acid precipitation occurs when sulfur
dioxide and nitrogen oxides combine
with moisture in the atmosphere
and create acids that fall as precipitation.
Acid precipitation can be in the form
of rain, snow, and fog.
It affects the chemistry of water in
lakes and rivers and can harm
organisms living in the water.
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