Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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Section 2 - The Ozone Shield
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1.
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Scientists estimate that a single chlorine molecule in the CFC structure can
destroy as many as ___________ ozone molecules.
a. | 100 | b. | 1,000 | c. | 10,000 | d. | 100,000 |
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2.
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As the amount of ozone in the stratosphere decreases,
a. | more ultraviolet light is able to reach Earth’s surface. | b. | less solar energy is
able to reach Earth’s surface. | c. | the amount of methane in the atmosphere
increases. | d. | the amount of phytoplankton in the ocean increases. |
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3.
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Polar stratospheric clouds are high-altitude clouds made of
a. | ozone and CFCs. | b. | ozone and molecular
chlorine. | c. | water and nitric acid. | d. | water and sulfuric
acid. |
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4.
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Which of the following is not a damaging effect of ultraviolet light on
the amphibian population?
a. | interference with photosynthesis | b. | death of eggs | c. | genetic mutations
among survivors | d. | reduction of populations |
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5.
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High ultraviolet (UV) radiation levels at Earth’s surface can
a. | produce CFCs. | b. | damage DNA. | c. | thin the ozone
layer. | d. | change weather patterns. |
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Matching
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Section 2 - The Ozone Shield
Choose the letter of the term or
phrase that best matches the description.
a. | polar vortex | d. | ozone
layer | b. | chlorofluorocarbons | e. | phytoplankton | c. | skin cancer |
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6.
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strong circulating winds over Antarctica
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7.
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a possible consequence to humans from a thinning ozone layer
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8.
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single-celled organisms that live near the ocean’s surface
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9.
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a part of the stratosphere that absorbs most of the ultraviolet light from the
sun
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10.
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a class of human-made chemicals that may damage the ozone layer
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