Unit 9 Global Change Review

"Bad ozone" occurs in the

• Lithosphere

• Mesosphere

• Stratosphere

• Troposphere

The main elements in CFCs are

• Carbon, Calcium, Francium

• Carbon, Chlorine, Fluorine

• Chromium, Chlorine, Fluorine

• Chlorine, Fluorine, Calcium

Which of the following best exemplifies global collaboration for a sustainable environment? (Getting rid of CFCs)

• The Antarctic Treaty of 1961

• The Clean Air Act of 1972

• CERCLA (Superfund)

• The Montreal Protocol

Which of the following best describes the importance of ozone in the stratosphere to life on Earth?

• Ozone reflects X-rays from the Sun back into space.

• Ozone absorbs most of the ultraviolet radiation from the Sun.

• Ozone helps to moderate surface temperature by absorbing CO2 and CH4.

• Ozone increases mutation rates and accelerates evolution in a variety of species.

The drop in stratospheric ozone levels in the Southern Hemisphere (the "ozone hole") is most evident during which season?

• Antarctic spring (October)

• Antarctic autumn (April)

• Antarctic summer only (January)

• Antarctic winter only (July)

Most ozone is formed in the stratosphere by reaction between carbon dioxide and free oxygen atoms.

• True

• False

The second step of ozone formation involves atomic oxygen combining with what molecule?

• CO2

• O2

• NO2

• 2H2O

The breakdown of CFCs in the atmosphere is caused by UV rays.

• True

• False

In the breakdown of ozone, chlorine acts as a

Which of the following is a greenhouse gas that comes only from human sources?

• Nitrous oxide

• Carbon dioxide

• Methane

• Chlorofluorocarbons