Exploring the Air Around Us

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

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon

Which gas is essential for human respiration?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Helium

What percentage of the Earth's atmosphere is composed of oxygen?

• 21%

• 78%

• 0.03%

• 1%

Which property of gases allows them to fill any container they are placed in?

• Fixed shape

• Fixed volume

• Compressibility

• Fluidity

What is the main cause of air pollution?

• Natural disasters

• Human activities

• Animal respiration

• Photosynthesis

Which of the following is a harmful effect of air pollution on human health?

• Improved lung function

• Respiratory diseases

• Enhanced vision

• Increased energy levels

Why is oxygen important for living organisms?

• It is used in photosynthesis

• It is a source of energy

• It is needed for cellular respiration

• It is a waste product

What role does carbon dioxide play in the atmosphere?

• It is a primary component of air

• It is used by plants in photosynthesis

• It is a pollutant

• It is a source of oxygen

What is the approximate percentage of carbon dioxide in the Earth's atmosphere?

• 21%

• 78%

• 0.04%

• 1%

How does air pressure change with altitude?

• Increases with altitude

• Decreases with altitude

• Remains constant

• Fluctuates randomly