Explain how air pollution may influence the climate of a city
The constant outpouring of pollutants into the environment may influence the climate of a city. Certain particles reflect solar radiation, thereby reducing the sunlight that reaches the surface. Some particles serve as nuclei upon which water and ice form. Water vapor condenses onto these particles forming haze that reduces visibility. The added nuclei increase the frequency of city fog. Precipitation may be greater in cities than in the surrounding countryside due in part to the increased roughness of city terrain, brought on by large structures that cause surface air to slow and gradually converge. This piling-up of air over the city then slowly rises. At the same time, city heat warms the surface air, making it more unstable and enhancing rising air motions, which, in turn, aids in the formation of clouds and thunderstorms.
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Heavy metals ________
A) are not harmful unless they are directly ingested B) become less hazardous over time as they degrade chemically C) become less hazardous after incineration D) are unregulated by the U.S. government E) bioaccumulate in animal tissues
Which of the following is true of most fatty acids found in triglycerides?
A) They are unbranched. B) They contain more than 20 carbon atoms. C) They contain an odd number of carbon atoms. D) none of the above
What are the two most common elements in the earth's crust?
A. calcium and magnesium B. sodium and potassium C. oxygen and silicon D. aluminum and iron
After the year 1600, the human population began to grow more rapidly, owing to which of the following factors?
A. Increases in commerce and communication on a global scale, new agricultural developments, and better health care and improved hygiene B. Increases in commerce and communication on a global scale and new agricultural developments C. Better health care and improved hygiene D. Increases in commerce and communication on a global scale E. New agricultural developments