How do we know that chlorine caused the ozone hole?
A) From measurements of the relationship between the experimental release of chlorine from the land surface in Antarctica, and the depletion of ozone that appeared in the atmosphere a few days later.
B) From laboratory experiments involving a replica of the atmosphere over Antarctica.
C) From the relationship between the release of chlorine by the Pinatubo volcano and the depletion of ozone over Antarctica a few months later.
D) From theories of the chemical destruction of ozone, coupled with computer calculations.
E) From measurements of chlorine monoxide and ozone in the Antarctic atmosphere as the sun reappeared in the spring.
Question 2
Planet A has twice the mass of Planet B. From this information, what can we conclude about the escape speed for Planet A compared to that of Planet B?
A) The escape speed for Planet A must be twice as great as the escape speed from Planet B.
B) The escape speed for Planet A must be four times as great as the escape speed from Planet B.
C) The escape speed for Planet A is the same as the escape speed from Planet B.
D) The escape speed for Planet A is greater than the escape speed from Planet B, but we cannot say how much greater.
E) We cannot conclude anything about the escape speed for Planet A without knowing the radii of the two planets.
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