Air Composition and Pollution Quiz

What percentage of Earth's atmosphere is composed of nitrogen?

• 99.93%

• 0.93%

• 78%

• 21%

What is the second most abundant gas in Earth's atmosphere?

• Oxygen

• Methane

• Argon

• Carbon Dioxide

What percentage of Earth's atmosphere is oxygen?

• 78%

• 0.07%

• 0.93%

• 21%

What gas makes up 0.93% of Earth's atmosphere?

• Argon

• Carbon Dioxide

• Oxygen

• Nitrogen

What is the main source of nitrogen in Earth's atmosphere?

• Volcanic activity

• Radioactive decay

• Burning fossil fuels

• Photosynthesis

What percentage of each breath you take is composed of dry gases?

• 0.07%

• 21%

• 78%

• 99.93%

What is the remaining 0.07% of the air composed of?

• Only oxygen

• Only nitrogen

• Various small particles and trace gases

• Only argon

What are primary pollutants?

• Pollutants that are only natural

• Pollutants directly emitted from a source

• Pollutants formed by the reaction of primary pollutants

• Pollutants that are only man-made

What can burning wood or dung create?

• Polycyclic aromatic hydrocarbons

• Methane

• Sulfur oxides

• Water vapor

What natural compounds break down pollutants?

• Nitrogen oxides

• Oxidants

• Hydrocarbons

• Carbon monoxide