1. Ozone in the stratosphere

A. Is a harmful air pollutantB. Helps protect the Earth

by blocking harmful UV radiation

C. Neither A nor B

Is a harm

ful a

ir pollu

tant

Helps pro

tect th

e Earth b...

Neither A

nor B

33% 33%33%

2. The formula for ozone is

A. NOB. O2

C. O3

D. CFC

NO O2 O3CFC

25% 25%25%25%

3. Which type of UV radiation is most easily blocked and why is it most easily blocked?

A. UV-A, because it has the longest wavelength

B. UV-A, because it has the shortest wavelength

C. UV-C, because it has the longest wavelength

D. UV-C, because it has the shortest wavelength

UV-A, b

ecause

it has t

he ...

UV-A, b

ecause

it has t

he ...

UV-C, beca

use it

has the ...

UV-C, beca

use it

has the ...

25% 25%25%25%

UV-C has the shortest wavelength and is therefore most easily deflected in the outer atmosphere.

4. Which type of UV radiation has the most energy and is potentially the most harmful (if we are exposed to it)?

A. UV-AB. UV- BC. UV-C

UV-AUV- B

UV-C

33% 33%33%

Higher frequency wavelengths have the most energy and are the most potentially damaging.(UV-C is used in germicidal lights)

However, UV-A penetrates the furthest into skin tissue and can also be harmful.

5. The ozone layer can be depleted by

A. CFC’sB. Methyl bromideC. Supersonic jetsD. A and BE. A, B and C

CFC’s

Meth

yl bro

mide

Supersonic

jets

A and B

A, B and C

20% 20% 20%20%20%

Ozone depleting chemicals include CFC’s and other halogen compounds (F, Cl, Br and I)

Supersonic jet travel in the stratosphere can release NO2, which when in the ozone layer can break apart O3 molecules.

6. Chlorofluorocarbons (CFC’s) were used in

A. Refrigerator coolantsB. Styrofoam containersC. AerosolsD. A and BE. A, B and C

Refrige

rato

r coolants

Styrofo

am conta

iners

Aeroso

ls

A and B

A, B and C

20% 20% 20%20%20%

7. The international treaty in 1989 that phased out CFC’s was the

A. Kyoto ProtocolB. Montreal ProtocolC. Copenhagen AccordD. Rio Accord

Kyoto

Proto

col

Montre

al Pro

toco

l

Copenhagen Acc

ord

Rio Accord

25% 25%25%25%

8. The region that has the greatest seasonal depletion of the ozone layer is

A. The Artic (Northern Pole)B. Tropic of Cancer (around

23.5 N)C. The EquatorD. Tropic of Capricorn

(around 23.5 S)E. The Antarctic (Southern

Pole)The Arti

c (North

ern Pole)

Tropic

of Cance

r (aro

und ...

The Equator

Tropic

of Capric

orn (a

ro...

The Antarcti

c (South

ern ...

20% 20% 20%20%20%

9. The South Pole has a greater degree of ozone depletion due to

A. greater emissions of CFC’sB. greater emissions of SO2

C. a greater degree of wind mixing with lower latitudes

D. a lesser degree of wind mixing with lower latitudes

greater e

missions o

f CFC

’s

greater e

missions o

f SO2

a greater d

egree of w

ind...

a lesse

r degre

e of wind m

...

25% 25%25%25%

The Southern Hemisphere has much less land mass and much lower population. There is NOT a greater amount of CFC or other ozone depleting chemicals released

The Southern Hemisphere has a greater degree of ozone depletion because of the formation of a polar vortex in the winter. This occurs due to the fact that the South Pole is encircled by water which heats and cools more consistently. There isn’t as much regional variation in air pressure (and therefore winds) due to differential heating as in the Northern Hemisphere.

Southern Hemisphere Northern Hemisphere

10. When traveling to Australia, Argentina or other places near the South Pole, it is most important to slather on a thick layer of sunscreen due to ozone depletion during which months?

A. July and August (their Winter)B. September and October

(their Spring)C. December and January (their

Summer)D. April and May (their Fall)

July

and August

(their W

...

September a

nd Octo

ber ...

December a

nd January (t

...

April and M

ay (their

Fall)

25% 25%25%25%

While CFC’s accumulate in the polar clouds in winter, the reaction that breaks apart O3 requires sunlight. When the sun returns to the South Pole in spring (September) there is the maximum thinning of the ozone. Later in the year, as the polar vortex is broken up, the ozone is redistributed in the atmosphere.

11. Which of the statement regarding CFC’s is correct?

A. Are very persistent in the atmosphere, lasting more than 100 years on average.

B. Each chlorine atom from CFC molecule can catalyze the breakdown of many O3 molecules.

C. Both A and BD. Neither A nor B

Are very persiste

nt in th

...

Each ch

lorine ato

m from...

Both A and B

Neither A

nor B

25% 25%25%25%

1. B2. C3. D4. C5. E6. E7. B8. E9. D10. B