air and pollution

Which of these problems can be caused by air pollution?

• Respiratory problems

• Reduced food sources for humans

• Increased disease for humans

• Decrease in global temperatures

Air is mostly made up of what two gases?

• oxygen and nitrogen
• oxygen and hydrogen
• hydrogen and helium
• nitrogen and hydrogen

How much oxygen is in the air? (%)

• 25%
• 21%
• 68%
• 50%

Which gas creates green house effect in the atmosphere?

• Carbon dioxide

• Ozone

• Oxygen

• None of these

Does air have a weight?

• Yes, it does
• No, it doesn`t

The main gas for breathe is

• nitrogen
• oxygen
• argon
• hydrogen

how much nitrogen is there in air

• 67%

• 92%

• 78%

• 75%

Which of these does a fire need to burn?

• argon
• carbon dioxide
• nitrogen
• oxygen

A __________________ is an instrument used to measure air pressure.

• thermometer
• compass
• barometer
• anemometer

how do you say air is present in the soil