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建立人际资源圈Raining_Acid
2013-11-13 来源: 类别: 更多范文
Raining Acid
ACID RAIN
ACID RAIN "Statues dissolving and guns rusting, children choking and soil becoming poisoned, trees withering, rocks blackening. And the trout float belly-up" (Pawlick 184). These are some of the disastrous effects caused by acid rain. In North America this cancer eats into the very heart of industrialized eastern Canada and down the northeastern coast of the United States, from Vermont to North Carolina. Other areas of the United States are at risk too, but the Northeast is the worst hit region. Acid rain is rain with a high acidic content. But it encompasses more than just rain. It can be "any precipitation such as rain, snow, sleet, hail, fog and dew, or dry deposition, that contains sulfuric or nitric acids formed in the atmosphere from the burning of fossil fuels." (Tyson 184) The acidity of a substance is determined by using a pH scale. The scale runs from zero (very acid) to fourteen (alkaline). Neutral water such as distilled water has a pH of 7. "Natural" rain water has a pH of 5.6 due to chemicals in the air and is considered slightly acidic. Therefore, a pH of less than 5.6 is used to identify acid rain. The
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