Air and Its Importance

Our Earth is surrounded by _______.

• ozone

• water vapor

• carbon dioxide

• the atmosphere

What is air?

• Air is a mixture of oxygen and carbon dioxide that makes up the atmosphere.

• Air is a mixture of liquids that is spread into the atmosphere.

• Air is a mixture of gases that surrounds the Earth.

• Air is a mixture of solids that will evaporate over time.

Which two main gases make up air?

• Nitrogen and hydrogen

• Nitrogen and oxygen

• Nitrogen and carbon dioxide

• Oxygen and carbon dioxide

Which of the following are the components of air?

• Noble gases

• Dust

• Water vapor

• All of the above

What is the type of gas?

• Hydrogen

• Nitrogen

• Oxygen

• Carbon dioxide

Which of the following gases is needed for burning and rusting?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Which of the following is matched correctly?

• Helium

  Used in advertising signs

• Neon

  Filled into balloons to make them float upward

• Argon

  Filled into light bulbs

• Krypton

  Used in welding

Which of the following shows the importance of air?

• All living things need air to breathe.

• Plants need carbon dioxide to make food.

• Air helps to inflate beach balls, balloons and floats.

• All of the above

Which of the following causes air pollution?

• Burning of fossil fuels in vehicles

• Exhaust from factories

• Forest fires

• All of the above

Which of the following is not an effect of air pollution?

• Difficulty breathing

• Deforestation

• Global warming

• Acid rain