ACT Science – Section 4 – Test 3

The percent of Earth’s surface covered by high clouds in January 1987 was closest to which of the following?

Based on Table 1, a cosmic ray flux of 440,000 particles/m²/hr would correspond to a cover of low clouds that is closest to which of the following?

Is the statement “The monthly average cover of low clouds is more directly correlated with cosmic ray flux than is the monthly average cover of high clouds” consistent with Figures 1 and 3?

Which of the following figures best represents the monthly average cover of high, middle, and low clouds in January 1992?

High clouds are composed primarily of ice crystals, whereas low clouds are composed primarily of water droplets. This difference is most likely because the average air temperature at altitudes from: