Cover these topics

air is oxygen20% nitrogen and carbon dioxide

hygrometer: used to measure air temperature, humidty

anemometer: used to measure wind speed

barometer: used to measure air pressure

http://en.wikipedia.org/wiki/Barometer

how man uses air: aeroplanes, wind turbines,sailing, windmills

nature uses air for seed dispersion of flowers and trees

examples dandelion

Even helps mum dry the clothes

Search on http://en.wikipedia.org

Covering all these topics…teacher will be amazed… should give top marks…good luck!

We breathe air

Without air we would all die because all living things need air

We, humans, breathe Oxygen

There all other gases like Carbon Dioxide

or just use Google