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21.1 Air Pollution in the Lower Atmosphere 469<br />

A CLOSER LOOK 21.1<br />

Acid Rain<br />

Acid rain <br />

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2 -<br />

x <br />

<br />

Incre<strong>as</strong>ing<br />

acidity<br />

Neutral<br />

Incre<strong>as</strong>ing<br />

alkalinity<br />

0.1<br />

1<br />

2<br />

3<br />

4<br />

5<br />

6<br />

7<br />

8<br />

9<br />

10<br />

11<br />

12<br />

13<br />

14<br />

Battery acid<br />

Lemon juice<br />

Vinegar<br />

Milk<br />

Baking soda<br />

sea water<br />

Milk of Magnesia<br />

Ammonia<br />

Lye<br />

Acid<br />

Adult<br />

rain<br />

fish die<br />

Fish reproduction<br />

affected<br />

Normal range precipitation<br />

Normal range of stream water<br />

FIGURE 21.5 The pH scale shows the levels of acidity in<br />

various fluids. The scale ranges from less than 1 to 14, with 7 being<br />

neutral: pHs lower than 7 are acidic; pHs greater than 7 are alkaline<br />

(b<strong>as</strong>ic). Acid rain can be very acidic and harmful to the environment.<br />

(Source: http:/ga.water.usgs.gov/edu/phdiagram.html. Accessed<br />

August 12, 2005.)<br />

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-<br />

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Causes of Acid Rain<br />

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2<br />

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2 x <br />

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Sensitivity to Acid Rain<br />

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3

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