... . Smog spoils views and makes outdoor activity unpleasant. For the very young, the very old, and people who suffer from asthma or heart disease, the effects of smog are even worse: It may cause headaches or dizziness and can cause breathing difficulties. In extreme cases, ... destroy up to 100,000 ozone molecules in the stratosphere. Other pollutants, including nitrous oxide from fertilizers and the pesticide methyl bromide, also attack atmospheric ozone. Scientists are finding that under this assault the protective ozone layer in the stratosphere is thinning. In the Antarctic region, i...

• Word Count: 6167
• Approx Pages: 25
• Has Bibliography
• Grade Level: Undergraduate

... major risk factors for developing breast cancer can not be changed such as sex, aging, family or previous history. Lifestyle changes have been shown to reduce the chances of getting a heart attack, a stroke and developing some cancers. Regular exercise or heavy manual labor at work can reduce the chances of getting breast cancer. No one knows for sure why this is. It ... ...

• Word Count: 2529
• Approx Pages: 10
• Grade Level: High School