CFCS

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 all UV rays from reaching the earth’s surface.

• I only

• III only

• I,&II

• I,II,& III

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

• Montreal Protoccol

• Kyoto Protoccol

• Paris Agreement

• Minamata convention

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-ESS2-2

NGSS.HS-ESS3-4

NGSS.HS-ESS3-5

Antarctica has more pronounced ozone destruction because... (choose all that apply)

• the global distillation effect moves CFCs there more than the Arctic.

• the stratospheric ice clouds are more pronounced there

• the stratospheric ice clouds are less pronounced there

• the circumpolar vortex is more pronounced there

Antarctic _____ has the ______ free CFC levels and ______ ozone levels.

• Antarctic WINTER has the LOWEST free CFC levels and HIGHEST ozone levels.

• Antarctic WINTER has the HIGHEST free CFC levels and LOWEST ozone levels.

• Antarctic SUMMER has the LOWEST free CFC levels and HIGHEST ozone levels.

• Antarctic SUMMER has the HIGHEST free CFC levels and HIGHEST ozone levels.

Which options are true for Stratospheric ozone? (select all that apply)

• CFCs are stable in the troposphere

• CFCs are unstable in the stratosphere

• Tropospheric O3 is a pollutant and Stratospheric O3 is a protectant

• O3 naturally absorbs UV and breaks apart

Tags

NGSS.HS-PS4-3

What are CFCs primarily used for?

• Refrigerants

• Fertilizers

• Fuel additives

• Pesticides

Which of the following is a major environmental concern associated with CFCs?

• Global warming

• Ozone layer depletion

• Acid rain

• Deforestation

How do CFCs reach the stratosphere?

• They are lighter than air and float up

• They are carried by wind currents

• They are released directly into the stratosphere

• They are stable and gradually diffuse upwards

What happens to CFCs in the stratosphere?

• They break down and release chlorine atoms

• They combine with ozone to form oxygen

• They remain stable and inert

• They convert into harmless compounds

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4