IBESS 6.2 Stratospheric Ozone

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

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

Tags

NGSS.HS-PS1-2

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

• Montreal Protoccol
• Kyoto Protoccol
• Paris Agreement
• Yo MaMa

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.

Tags

NGSS.HS-PS4-4

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.

Tags

NGSS.HS-ESS3-6

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

• reduced photosynthetic activity

• increased skin cancer

• increased likelihood of cataracts

• increased birth defects

Tags

NGSS.HS-LS2-5

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

• increased crop yield

• reduced terrestrial biome productivity

Tags

NGSS.HS-LS2-6

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

Tags

NGSS.HS-PS4-4

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

Tags

NGSS.HS-ESS2-4

NGSS.HS-ESS3-6

Location of the large whole in the ozone.

• Antarctica

• Artic

• Iceland

• Africa