The Ozone Shield

strong circulating winds over Antarctica

• polar vortex

• skin cancer

• ozone layer

• phytoplankton

• chlorofluorocarbons

            a possible consequence to humans from a thinning ozone layer

• polar vortex

• skin cancer

• ozone layer

• phytoplankton

• chlorofluorocarbons

           single-celled organisms that live near the ocean’s surface

• polar vortex

• skin cancer

• ozone layer

• phytoplankton

• chlorofluorocarbons

           a part of the stratosphere that absorbs most of the ultraviolet light from the sun

• polar vortex

• skin cancer

• ozone layer

• phytoplankton

• chlorofluorocarbons

        a class of human-made chemicals that may damage the ozone layer

• polar vortex

• skin cancer

• ozone layer

• phytoplankton

• chlorofluorocarbons

Scientists estimate that a single chlorine molecule in the CFC structure can destroy as many as ___________ ozone molecules.

• 100 

• 10,000

• 1,000 

• 100,000

As the amount of ozone in the stratosphere decreases,

• more ultraviolet light is able to reach Earth’s surface.

• less solar energy is able to reach Earth’s surface.

• the amount of methane in the atmosphere increases

• the amount of phytoplankton in the ocean increases.

Polar stratospheric clouds are high-altitude clouds made of

• ozone and CFCs. 

• water and nitric acid.

• ozone and molecular chlorine. 

• water and sulfuric acid.

Which of the following is not a damaging effect of ultraviolet light on the amphibian population?

• interference with photosynthesis

• death of eggs

• genetic mutations among survivors

• reduction of populations

High ultraviolet (UV) radiation levels at Earth’s surface can

• produce CFCs. 

• thin the ozone layer.

• damage DNA.

• change weather patterns.