Air

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? (%)

• 21%

• 65%

• 100%

How much nitrogen is in the air? (%)

• 3%

• 100%

• 78%

We can touch air

• Yes 
• NO

Does air have a weight?

• Yes, it does
• No, it doesn`t

Can we see air?

• Yes, we can

• No we can`t it is invisible

With it, we feel the air

• sun
• rain
• wind

Does fire need oxygen?

• Yes, it does
• No, it doesn`t

The name of the gaseous envelope around the Earth

• atmosphere
• hydrosphere
• biosphere

The main gas for breathe is

• neon

• oxygen

• argon

• hydrogen