Air; The breathe of life

The two major components present in air are

• Methane and krypton
• Hydrogen and argon
• Carbon dioxide and helium
• Nitrogen and oxygen

Why do air bubbles come out when soil is added to water?

Which of the following gases is the most abundant in the Earth's atmosphere?

• Methane and krypton

• Hydrogen and argon

• Carbon dioxide and helium

• Nitrogen and oxygen

What is the primary gas responsible for the Earth's greenhouse effect?

• Methane

• Carbon dioxide

• Oxygen

• Nitrogen

Which gas is essential for respiration in humans?

• Methane

• Carbon dioxide

• Oxygen

• Nitrogen

The air dissolved in water is known as

Draw a simple diagram for upward displacement.

Why is air vital for the survival of living organisms?

What percentage of the air we breathe is made up of oxygen?

• 18%

• 21%

• 25%

• 30%

What is the most abundant gas in the composition of air?

• Oxygen

• Carbon Dioxide

• Argon

• Nitrogen