AnswersSTPSB_Environmental Science 2627Lab: Absorption and Radiation by Land and Water

Week 8: Ozone Answers

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1
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Over 95% of incoming UV-B radiation is absorbed in the stratosphere. Please select the best answer from the choices provided

A
T
B
F
2
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Halons contain halogens, which are highly reactive with oxygen.

A
T
B
F
3

How does the ozone layer affect life on Earth?

A
causes respiratory illness
B
increases photosynthesis in plants
C
causes damage to living tissue
D
filters out harmful ultraviolet radiation
4

Ozone is formed when _______.

A
two oxygen molecules combine
B
an individual oxygen atom combines with an oxygen molecule
C
ultraviolet radiation breaks apart four oxygen molecules
D
oxygen molecules are broken into separate atoms
5

Depletion to the ozone layer can cause changes to the biogeochemical cycles.

A
T
B
F
6

How does the absorption of ultraviolet radiation by the ozone layer help sustain life?

A
This process helps maintain the temperature of the Earth.
B
It keeps a low level of harmful ultraviolet radiation from reaching living organisms.
C
This process keeps ozone concentrations in the troposphere at lower levels.
D
All of the above are true.
7

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer?

A
The chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced.
B
The chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production.
C
Free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone.
D
Chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone.
8

Which of the following is a health risk associated with ground-level ozone?

A
cataracts
B
skin cancer
C
respiratory illness
D
all of the above
9

Which of the following is a possible consequence of ozone layer depletion on living organisms?

A
increased exposure to ground-level ozone
B
decreased levels of ultraviolet radiation in the troposphere
C
increased levels of ultraviolet radiation absorption in the stratosphere
D
none of the above
10

When is ozone considered a pollutant?

A
in the stratosphere
B
in the mesosphere
C
in the troposphere
D
in the thermosphere

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Lab: Absorption and Radiation by Land and Water