Order Chlorofluorocarbons Discussion Question
Order 59083627
Order Chlorofluorocarbons Discussion Question
1. Chlorofluorocarbons (CFCs) are the main cause of anthropogenic
ozone depletion. What are CFCs used for?
(A) plastics
(B) paper products
(C) water softeners
(D) refrigerants and propellants
432. Depletion of the protective ozone layer can increase our exposure to
_________. This can harm humans, other life forms, and materials.
Excess exposure may lead to skin cancer.
(A) UV-A
(B) UV-B
(C) UV-C
(D) UV-D
433. If humans comply with the Montreal Protocol and discontinue
the use of ODC (ozone-depleting compounds), the ozone layer is
predicted to be fully repaired by
(A) 2020
(B) 2030
(C) 2040
(D) 2050
Order Chlorofluorocarbons Discussion Question
434. Chlorofluorocarbons are harmful and break apart ozone. Where are
they most damaging in the atmosphere?
(A) ionosphere
(B) stratosphere
(C) thermosphere
(D) exosphere
435. Nitrogen oxides make up what percentage of U.S. emissions of
greenhouse gases?
(A) 35%
(B) 14%
(C) 60%
(D) 72%
Global Change ❮ 151
436. How much higher is the amount of carbon dioxide in the
atmosphere today compared to the mid-1700s?
(A) 80%
(B) 50%
(C) 145%
(D) 30%
437. Approximately how much of the sunlight reaching earth is reflected
back into space?
(A) ¾
(B) ½
(C) ⅓
(D) ⅛
438. Deforestation, burning of fossil fuels, and other activities that release
greenhouse gases all contribute to
(A) solar emissions
(B) changing ocean currents
(C) decreasing sea levels
(D) global warming
Order Chlorofluorocarbons Discussion Question
439. Which of the following is NOT a source of methane?
(A) cows
(B) landfills
(C) forest fires
(D) aerosols
Order Chlorofluorocarbons Discussion Question
440. Rising sea levels that result from global warming are caused by
I. melting of glaciers
II. expanding oceans due to warmer temperatures
III. more rainfall
(A) I only
(B) II only
(C) I and II only
(D) II and III only
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