Which of the following is true regarding ozone depletion in Antarctica?
A) Increasing levels of ultraviolet radiation have not actually been measured at this time.
B) The atmosphere above Antarctica has experienced a complete loss of protective ozone.
C) Maximum ozone depletion occurs during the Antarctic spring, following the development of polar stratospheric clouds in winter.
D) There has actually been a decrease in ultraviolet levels measured at the surfacewhich is contrary to what is predicted by ozone depletion models.
Question 2
Glacial ice is
A) essentially the same as snow.
B) formed from continual accumulation of snow that recrystallizes under its own weight into an ice mass over a period of many years.
C) made of sedimentary rock.
D) generally less dense than snow and firn.
A genetic bottleneck reduces a population temporarily to very low levels, removing much of its genet
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