Air and its uses

Atmosphere has how many layers

• 6

• 5

• 8

• 4

We live in the

• Mesosphere

• Stratosphere

• Exosphere

• Troposphere

_____ protest us from UV rays of the sun

• Ozone layer

• Troposphere

• Mesosphere

• Ionosphere

Argon is a

• odourless

• carbon dioxide

• colourless

• oxygen

Argon is used to make

• light bulb

• chair

• desk

• tubelight

Nitrogen has

• 77%

• 78%

• 74%

• 76%

Oxygen has

• 22%

• 24%

• 23%

• 21%

Nitrogen

• does support burning

• does not support burning

Water is denser than

• water

• air

• fire

• all of the above

Constantly inhaling polluted air may affect the_____and_____to many respiratory problems.

• stomach

• lungs

• leads

• brain issues