Stratospheric Ozone Depletion

1.

Multiple Choice

30 sec

1 pt

Second layer of the atmosphere, extending about 17-48 kilometers above the earth’s surface. It contains a layer of gaseous ozone, which filters out about 95% of the incoming harmful ultraviolet radiation emitted by the sun

Mesosphere

Troposphere

Stratosphere

Ozone

2.

Multiple Choice

30 sec

1 pt

Layer of gaseous ozone in the stratosphere that protects life on earth by filtering out most harmful ultraviolet radiation from the sun

Greenhouse Gases

Troposphere

Stratosphere

Ozone Layer

3.

Multiple Choice

3 mins

1 pt

The breakdown of stratospheric ozone
I. can originate from the emission of chlorofluorocarbons (CFCs).
II. is catalyzed through a free chlorine (Cl) atom.
III. prevents UV rays from reaching the earth’s surface.

I only

III only

I,&II

I,II,& III

4.

Multiple Choice

2 mins

1 pt

Which agreement allowed for a reduction, and eventual elimination, of CFC production and use?

Montreal Protoccol

Kyoto Protoccol

Paris Agreement

Yo MaMa

5.

Multiple Choice

1 min

1 pt

How do CFCs affect ozone production?

UV radiation frees a chlorine atom, which breaks down ozone.

Infrared radiation frees a chlorine atom, which breaks down ozone.

UV radiation frees a fluorine atom, which breaks down ozone.

Infrared radiation frees a chlorine atom, which breaks down ozone.

6.

Multiple Choice

1 min

1 pt

Depletion of ozone layer is a concern because it normally absorbs ____% of the sun's UV radiation.

50

75

89

99

7.

Multiple Choice

30 sec

1 pt

Which of these sets of three items produce CFCs

cars, factories, and cardboard

spray cans, cardboard, insulation

spray cans, refrigerant, cardboard

spray cans, refrigerant, insulation

8.

Multiple Choice

30 sec

1 pt

Though CFC production has been curtailed, the threat to upper atmosphericozone continues because CFCs

become harmless quickly.

destroy ozone for only a short time.

persist but stop destroying ozone.

persist and continue to destroy ozone for decades.

9.

Multiple Choice

1 min

1 pt

When oxygen gas in the lower stratosphere is struck by this, it splits, leading to the formation of a ozone molecule.

visible light

ultraviolet radiation

infrared

gamma rays

10.

Multiple Choice

15 mins

1 pt

The formation of ozone begins when and O2 molecule is split by

UV-A radiation

UV-B radiation

UV-C radiation

UV-A or UV-B radiation

11.

Multiple Choice

1 min

1 pt

How many ozone atoms can a single chlorine atom break down?

5,000

10,000

50,000

100,000

12.

Multiple Choice

30 sec

1 pt

Which is NOT a result of the reduction in stratospheric ozone?

reduced photosynthetic activity

increased skin cancer

increased likelihood of cataracts

increased birth defects

13.

Multiple Choice

15 mins

1 pt

Through international cooperation, the concentration of chlorine in the atmosphere

has already decreased below 3ppb

will stabilize around 3ppb by 2030

has stabilized at 5ppb

is expected to stabilize at 5ppb by 2100

14.

Multiple Choice

1 min

1 pt

When is the ozone hole largest?

early Antarctic spring

late Antarctic summer

early Antarctic winter

late Antarctic fall

15.

Multiple Choice

30 sec

1 pt

Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?

CFCs

HFCs

DDT

CFCl2

16.

Multiple Choice

30 sec

1 pt

Which is not an example of an ecological consequence of reduced stratospheric ozone?

loss of biodiversity from reduced photosynthesis in plants

collapse of marine food webs

reduced crop yield

reduced terrestrial biome productivity

17.

Multiple Choice

30 sec

1 pt

UV rays can cause obvious short term damage, such as sunburn, as well as long term damage that accumulates with each exposure to the sun.

True

False

18.

Multiple Choice

30 sec

1 pt

Which statement regarding the decreased level of stratospheric ozone is correct?

Increased photosynthetic activity has been measured in the phytoplankton around Antarctica

The largest decrease in the level of stratospheric ozone over the Arctic region occurs between January and April

Although the Montreal Protocol led to a reduction in the use of CFCs, it will have little effect on stratospheric ozone levels in the long term

There is no correlation between the incidence of cataracts and skin cancers and the lower level so stratospheric ozone

The global crop yields of wheat, rice, and corn have increased since the reduction in CFC use

19.

Multiple Choice

30 sec

1 pt

Which is most strongly absorbed by ozone in the statosphere?

UV-A

UV-B

UV-C

UV-B and UV-C

UV-A and UV-B

20.

Multiple Choice

30 sec

1 pt

Location of the large whole in the ozone.

Antarctica

Artic

Iceland

Africa

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