What is Air Made of?

What percentage of the air is oxygen?

• About 78%

• About 21%

• About 1%

• About 50%

Where does most of Earth's oxygen come from?

• Deserts

• Mountains

• Oceans

• Forests

Tags

NGSS.MS-LS1-6

How does the oxygen level change with altitude?

• Increases with altitude

• Decreases with altitude

• Remains constant

• Varies randomly

What tiny organisms contribute to most of the Earth's oxygen?

• Bacteria

• Fungi

• Trees

• Plankton

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What increases the oxygen level in the air?

• Climbing a mountain

• Being in a desert

• Being near the ocean

• Cold weather

Tags

NGSS.MS-LS1-6

What gas makes up the majority of the air?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Argon

What happens to nitrogen when we breathe it in?

• It is used in digestion.

• It is exhaled unchanged.

• It is converted into oxygen.

• It is absorbed by the body.

Tags

NGSS.MS-LS2-3

What is the role of nitrogen in our breathing process?

• Essential for energy production

• Converted into carbon dioxide

• Absorbed into the bloodstream

• Has no significant role

Which of the following is NOT a component of the final 1% of air?

• Water vapor

• Dust

• Neon

• Oxygen

Which gas is present in trace, or small, amounts in the air?

• Oxygen

• Nitrogen

• All of the above

• Carbon dioxide