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- 1. Multiple ChoiceSecond 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 sunMesosphereTroposphereStratosphereOzone
- 2. Multiple ChoiceLayer of gaseous ozone in the stratosphere that protects life on earth by filtering out most harmful ultraviolet radiation from the sunGreenhouse GasesTroposphereStratosphereOzone Layer
- 3. Multiple Choice
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 onlyIII onlyI,&III,II,& III - 4. Multiple ChoiceWhich agreement allowed for a reduction, and eventual elimination, of CFC production and use?Montreal ProtoccolKyoto ProtoccolParis AgreementYo MaMa
- 5. Multiple ChoiceHow 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 ChoiceDepletion of ozone layer is a concern because it normally absorbs ____% of the sun's UV radiation.50758999
- 7. Multiple ChoiceWhich of these sets of three items produce CFCscars, factories, and cardboardspray cans, cardboard, insulationspray cans, refrigerant, cardboardspray cans, refrigerant, insulation
- 8. Multiple ChoiceThough CFC production has been curtailed, the threat to upper atmosphericozone continues because CFCsbecome harmless quickly.destroy ozone for only a short time.persist but stop destroying ozone.persist and continue to destroy ozone for decades.
- 9. Multiple ChoiceWhen oxygen gas in the lower stratosphere is struck by this, it splits, leading to the formation of a ozone molecule.visible lightultraviolet radiationinfraredgamma rays
- 10. Multiple ChoiceThe formation of ozone begins when and O2 molecule is split byUV-A radiationUV-B radiationUV-C radiationUV-A or UV-B radiation
- 11. Multiple ChoiceHow many ozone atoms can a single chlorine atom break down?5,00010,00050,000100,000
- 12. Multiple Choice
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 ChoiceThrough international cooperation, the concentration of chlorine in the atmospherehas already decreased below 3ppbwill stabilize around 3ppb by 2030has stabilized at 5ppbis expected to stabilize at 5ppb by 2100
- 14. Multiple Choice
When is the ozone hole largest?
early Antarctic spring
late Antarctic summer
early Antarctic winter
late Antarctic fall
- 15. Multiple Choice
Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?
CFCs
HFCs
DDT
CFCl2
- 16. Multiple Choice
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
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
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
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
Location of the large whole in the ozone.
Antarctica
Artic
Iceland
Africa
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