Which of the following has been a major source of ozone destruction over the past 50 years?

Which of the following has been a major source of ozone destruction over the past 50 years?

A) ethylene glycol
B) carbon dioxide
C) chemiosmosis
D) chlorofluorocarbons





Answer: D

Ozone

Ozone

A) formation is promoted by CFCs.
B) protects Earth from UV radiation.
C) is broken down by carbon dioxide.
D) is a source of oxygen for cellular respiration.

Answer: B

Which of the following statements about the greenhouse effect is true?

Which of the following statements about the greenhouse effect is true?

A) The greenhouse effect will decrease the average temperature of the planet.
B) The greenhouse effect is reduced by deforestation.
C) The greenhouse effect has no direct relationship with the Industrial Revolution of the 1800s.
D) The greenhouse effect is exacerbated by the use of fossil fuels.

Answer: D

Global warming due to the greenhouse effect may be

Global warming due to the greenhouse effect may be

A) made worse by photosynthesis, which adds carbon dioxide to the atmosphere.
B) moderated by photosynthesis, which removes carbon dioxide from the atmosphere.
C) of little concern, since it is part of the normal cycle for the planet.
D) reduced by the burning of fossil fuels, which removes oxygen from the atmosphere.

Answer: B