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Unformatted text preview: riod. New ice is deposited over the previously deposited ice, trapping the air from the past. Thus, analysis of ice cores provides the composition of the past air, which can be used to determine the From the ice core data, the concentration of CO2 during previous fluctuations (over the past 400,000 years) was higher than today's concentration. Correct B ) FALSE The CO2 concentration did not rise above 310 ppm at any time in the past 400,000 years although the temperature did. Present time CO2 concentration is 370 ppm. When carbon in a fossil burns, it combines with oxygen to form _____. Correct A ) CO2 The carbon in the fuel combines with the oxygen in the air used for burning and forms carbon dioxide. One of the ways to reduce greenhouse gases is to use energy efficent appliances. Correct A ) TRUE Energy efficient appliances help to reduce greenhouse gases The ozone hole has _____. Correct A ) lower than 220 Dobson units of ozone concentration Ozone hole has lower than 220 dobson units of ozone concentration Sun spots can decrease the radiation from the Sun. Correct B ) FALSE Sun spots (intense flares on the surface) can increase the radiation from the sun. Acid rain precursors in the US reduce visibility by _____. Correct D ) 0.6 Sulfate particles account for 50 to 70 percent of the visibility reduction in the eastern part of the United States, affecting our enjoyment of national parks, such as the Shenandoah and the Great Smoky Mountains. In large cities, ozone is at the highest concentration at which time of day? Correct C ) late afternoon In the presence of sunlight by mid- afternoon NOx react with VOCs to form ozone The primary source for nitrogen oxide emissions in the US is motor vehicles Correct A ) TRUE The primary sources of NOx are motor vehicles, electric utilities, and other industrial, commercial, and residential sources that burn fuels Sulfates and nitrates that form in the atmosphere from sulfur dioxide (SO2) and nitrogen oxides (NOx) emissions contribute to _____. Correct B ) visibility reduction S...
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