Stratospheric Ozone Depletion

Ozone in the stratosphere is formed in two steps. The first involves breaking down oxygen (O2) by

• particulates

• carbon dioxide

• ozone

• sunlight

Tags

NGSS.HS-PS1-5

NGSS.HS-PS4-3

The ozone hole is over which place?

• Antartica

• South America

• Aftrica

• Arctic

What important international agreement limited/banned CFCs in many countries?

• Clean Water Act

• Clean Air Act

• Montreal protocol

• International Act of Ozone

Layer of reactive gas at 20-30km above the Earth (15-20km at the poles) absorbing UV radiation

• Greenhouse Gases

• Troposphere

• Stratosphere

• Ozone Layer

Tags

NGSS.HS-PS4-3

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

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-PS1-5

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-ESS3-6

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

Which are consequences of stratospheric ozone depletion? (select all that apply)

• cataracts

• skin cancer

• phytoplankton population increase

• decreased crop yield

• wrinkling/aging/burning of skin

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

• Montreal Protoccol

• Kyoto Protoccol

• Paris Agreement

• Minamata convention

Tags

NGSS.HS-ESS3-6