Understanding Air and Its Importance

What percentage of air is made up of nitrogen?

• 1%

• 78%

• 50%

• 21%

Which of the following is NOT a use of air mentioned in the video?

• Growing plants

• Propelling sailboats

• Flying airplanes

• Generating electricity

What is a common source of air pollution?

• Smoke

• Rain

• Sunlight

• Water

Which action can help reduce air pollution?

• Burning more trash

• Using more gasoline

• Planting trees

• Increasing electricity usage

How can trees help in maintaining clean air?

• Through photosynthesis

• By providing shade

• By absorbing sunlight

• By blocking wind