Passage III
Cloud cover is the percent of Earth's surface covered by clouds. Cloud cover may increase because of an increase in the cosmic ray flux (number of high-energy particles from space reaching Earth per m2 per hour). Table 1 shows how Earth's cover of low clouds (0 km to 3.2 km altitude) varies with the cosmic ray flux. Figures 1−3 show the relative cosmic ray flux, RCRF (the percent below the flux measured on October 1, 1965), and the monthly average cover of high clouds (6.0 km to 16.0 km altitude), middle clouds (3.2 km to 6.0 km altitude), and low clouds, respectively, from January 1980 to January 1995.
16. Which of the following figures best represents the monthly average cover of high, middle, and low clouds in January 1992 ?
Your Answer is
Correct Answer is G
Explanation
Looking at figure 1 & 2 & 3, when the abscissa is Jan. 1990, the ordinates corresponding to the monthly average cover are 14.0, 20.0, and 28.0 respectively, so corresponding to the histogram, the low clouds are the highest, and the high clouds are the lowest< /p>