Understanding Air and Its Components

What is the most abundant gas in Earth's air?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon

What percentage of Earth's air is made up of oxygen?

• 21%

• 78%

• 1%

• 50%

Which of the following gases is NOT a major component of air?

• Helium

• Methane

• Oxygen

• Hydrogen

What is the invisible form of water in the air called?

• Ice

• Water vapor

• Liquid water

• Steam

What is the main reason we need oxygen in the air?

• To form clouds

• To live

• To create dust

• To produce nitrogen

Describe how water is a part of our air?

• It forms clouds

• It is in the form of vapor

• It creates rain

• It is solid ice.

Which stage of the water cycle involves water vapor cooling and forming clouds?

• Evaporation

• Condensation

• Precipitation

• Collection

What is the main component of air?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Water Vapor

How is water part of our air?

• As solid ice particles

• As water vapor

• As liquid rain

• As snowflakes.

What are ways that humans influence which particles are in the air?

• By planting trees

• By using air purifiers

• By burning fossil fuels

• By recycling