Assignment 63 Understanding Ozone and Ozone Depletion
Answer all of the following
questions to the best of your ability.
1. Which of the following
statements is most accurate?
A. Ozone near the surface of
Earth protects us from ultraviolet radiation.
B. Ozone in the stratosphere
protects us from harmful radiation from the Sun.
C. Exposure to ozone increases
one’s risk of skin cancer.
D. Ozone is added to the
atmosphere by fossil fuels.
E. Ozone can form in the deep
ocean.
2. What role do
chlorofluorocarbons play in the environment?
A. They add ozone to the
troposphere. D. They lead to the
depletion of stratospheric ozone.
B. They add ozone to the
stratosphere. E. They no longer
pose a threat to the environment.
C. They lead to the depletion of
ground-level ozone.
3. The type(s) of ultraviolet radiation most strongly absorbed by
ozone in the stratosphere would be
A. UVA. D. UVB and UVC.
B. UVB. E. UVA and UVB.
C. UVC.
Free Response Practice
4. In the mid 1970s, Sherwood Rowland and Mario Molina
predicted a thinning of the stratospheric ozone layer over Antarctica. The
thinning was confirmed in the late twentieth century and has continued into the
twenty-first century.
a. Identify the class of chemical compounds that is
primarily responsible for the thinning of the stratospheric ozone layer and
describe TWO major uses for which these chemicals were manufactured.
b. Describe how the chemical compounds that you identified
in part a. destroy stratospheric ozone molecules. You may include chemical
equations as part of your answer.
c. Identify the major environmental consequence of the
depletion of stratospheric ozone and describe TWO effects on ecosystems and/or human
health that can result.
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