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NEW QUESTION 28
Radiative forcings are changes imposed on the planetary energy balance; radiative feedbacks are changes induced by climate change. Forcings can arise from either natural or anthropogenic causes. For example, the concentration of sulfate aerosols in the atmosphere can be altered by volcanic action or by the burning of fossil fuels. The distinction between forcings and feedbacks is sometimes arbitrary; however, forcings are quantities normally specified in global climate model simulations, while feedbacks are calculated quantities. Examples of radiative forcings are greenhouse gases (such as carbon dioxide and ozone), aerosols in the troposphere, and surface reflectivity. Radiative feedbacks include clouds, water vapor in the troposphere, and sea-ice cover. The effects of forcings and feedbacks on climate are complex. For example, clouds trap outgoing radiation, thus providing a warming influence, while also reflecting incoming solar radiation and, thereby, providing a cooling influence. Current measurements indicate that the net effect of clouds is to cool the earth. However, scientists are unsure if the balance will shift in the future as the atmosphere and cloud formation are altered by the accumulation of greenhouse gases. Similarly, the vertical distribution of ozone affects both the amount of radiation reaching the earth's surface and the amount of reradiated radiation that is trapped by the greenhouse effect. These two mechanisms affect the earth's temperature in opposite directions.
Based solely on the information in the passage, which of the following research methods, if implemented, would be most likely to yield a more accurate prediction of the extent and direction of the greenhouse effect?
- A. Measuring variations in cloud density in relation to air temperature
- B. Isolating the cooling influence1 of ozone changes from their warming influence
- C. Monitoring radiative feedbacks and forcings over a longer time period
- D. Accounting for the altitude at which cloud formations appear
- E. Isolating ozone changes caused specifically by anthropogenic factors
Answer: B
Explanation:
Explanation/Reference:
Explanation:
According to the passage, a given vertical distribution of ozone affects atmospheric temperatures in both directions at once. Accordingly, by isolating the cooling influence of a given distribution of ozone from its warming influence, scientists might better predict whether changes in the vertical distribution of ozone will have a net cooling or a net warming effect.
NEW QUESTION 29 
- A. The quantities are equal;
- B. The quantity in Column B is greater;
- C. The quantity in Column A is greater;
- D. The relationship cannot be determined from the information given.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
The quickest route to the correct answer is to compare corresponding terms. For example, compare (in
Column A) to (in Column B). Notice that . When you add the same number to a fraction's
numerator as its denominator, the fraction's value increases, and so . You can analyze the other corresponding fraction pair in the same way. The value of the each fraction in Column A is greater than the value of the corresponding term in Column B Thus, the sum of the fractions in Column A must be greater than the sum of the fractions in Column B.
NEW QUESTION 30
For the five days shown, the median daily number of television viewers, in millions, was closest to which of the following?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: C
NEW QUESTION 31
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