Air/Wind

The layer of air surrounding the Earth is called ___________.

• gas

• wind

• atmosphere

____________ is made up of nitrogen, oxygen, carbon dioxide and noble gases. It has also other components such as water vapor, dust and microorganisms.

• Air

• Air pollution

• Atmosphere

__________ is the largest component of air, It is used to make fertilizers and explosives.

• Carbon dioxide

• Nitrogen

• Oxygen

________________ is needed by all living things and for burning and rusting.

• Oxygen

• Nitorgen

• Carbon dioxide

______________ is needed by plants for photosynthesis.

• Oxygen

• Nitorgen

• Carbon dioxide

___________ is used in baloons.

• Helium

• Neon

• Argon

___________ is used in advertising signs.

• Helium

• Neon

• Argon

___________ is used in light bulbs

• Helium

• Neon

• Argon

_______________ in the air can make us sick.

• Dust and microorganisms

• Carbon dioxide

• Nitrogen

All living organisms need _______ to breathe.

• air

• water

• food