Which of the following is the most abundant atmospheric component?

• oxygen
• nitrogen
• carbon dioxide
• methane

Which of the following atmospheric components is beneficial to humans at higher altitudes, but dangerous near ground level?

• Nitrogen
• Oxygen
• Carbon Dioxide
• Ozone

Which of the following is an example of a natural change in atmospheric composition?

• daily changes in the amount of water vapor in the air
• chemical compounds from industrial processes change the acidity of rain
• carbon dioxide releases from the burning of fossil fuels
• variation in the amount of ozone located at ground level

How are the components of air related to the water cycle?

• Dust and sand absorb moisture in the air
• Nitrogen and oxygen are taken out of the air by rain.
• Water vapor in the air condenses and falls as rain.
• Ozone helps clouds remain high in the atmosphere.

Which of the following is the only list representing natural components of the atmosphere?

• dust, argon, and smog 
• pollen, oxygen, and carbon dioxide
• pollen, sulfuric acids, smog
• dust, oxygen, and sulfuric acids

Which of the following is not true?

• Earth's atmosphere does not change
• Earth's atmosphere has changed naturally over time.
• Human activities have caused big changes in Earth's atmosphere.
• Living things must adapt to changes in Earth's atmosphere.

Which of the following is not a result of acid rain?

• increased erosion of rock formations
• smog near Earth's surface
• damage to the roots and leaves of plants
• increased rusting of cars and other metal objects

Which of the following is a valid method for reducing the amount of greenhouse gases in the atmosphere?

• Reduce the use of chemicals that destroy ozone in the stratosphere.
• Decrease the use of alternative fuel sources such as solar energy.
• Decrease the amount of fossil fuels burned by cars.
• Decrease the amount of acid rain in the sky by altering cloud patterns.

Which of the following processes result from the release of sulfur compounds into the air?

• global warming
• humidity changes
• acid rain
• ozone destruction

Which of the following correctly describes the greenhouse effect?

• Air temperatures increase due to increased amounts of carbon dioxide in the atmosphere.
• Earth's atmosphere heats naturally when solar radiation is absorbed.
• Air pollution causes the release of greenhouse gases into the atmosphere.
• The greenhouse effect and global warming are the same processes.