Human Impact Unit Test

How can the ozone layer be replenished?

• By manufacturing more ozone

• By not using ozone-depleting chemicals, and waiting for more ozone to be produced naturally

• By limiting the amount of carbon dioxide we pump into the atmosphere

• The ozone layer can never be replenished

What does it mean when a product or service is "EPA certified?"

• It's insured by the U.S. government

• The U.S. government recommends that you should buy it

• The U.S. government has made sure it cannot harm you if you ingest it

• The U.S. government has made sure it does not harm the environment

In which areas would people most likely be affected by the ozone hole?

• Scandinavia and northern Canada

• Australia and southern Africa

• The equator and its surrounding area

• The southern United States

Why wasn't ozone depletion a problem until the 20th century? Choose the best answer.

• The atmosphere was much thicker before the 20th century

• Humans didn't begin using ozone-depleting chemicals until modern times

• Ozone was created naturally at a much faster rate before the 20th century

• People didn't live in areas affected by ozone depletion until the 20th century

Which of these is an opinion about CFCs?

• They are the most harmful chemicals ever invented

• They were once used as propellants in aerosol cans

• They did a lot of damage to the ozone layer

• Many countries agreed to cut down on their use during the late 1980s

Like cigarette smoke, UV radiation is bad for you because it's carcinogenic. What does "carcinogenic" mean?

• Chemical

• Molecular

• Cancer-causing

• High-energy

Place the following events in sequence: A) The ozone hole is discovered; B) The Montreal Protocol is signed; C) 190 countries agree to stop CFC production

• A - B - C

• A - C - B

• B - A - C

• C - A - B

One ozone molecule contains three _____ of oxygen.

• Molecules

• Atoms

• Electrons

• Ounces

What can you infer from the fact that although CFCs have been banned, refrigerators and aerosol cans are still being sold?

• Manufacturers of these products are breaking the law

• People who use these products don't care about the environment

• These products were all manufactured before the ban went into effect

• Researchers found environmentally safe replacements for CFCs

If CFCs had not been banned, what might have happened?

• The ozone hole would probably have continued expanding

• All ozone molecules would have disappeared from the atmosphere

• Humans would no longer be able to go outside

• The earth would have become much hotter