We should grow more___________ to keep the air fresh and clean.
plants/ trees
How do we use wind?
breathing, sail boat to sail, wind mills to move, kites to fly, dry clothes etc
How can we feel air? Give one example.
Blowing air on our hand, riding bicycle etc.
Heat changes water into
Water vapor or steam.
What do we call strong wind with by thunder, rain and lightening?
Storm
What do we use to check the direction of wind?
Wind vane
Gentle wind is ____________
breeze
hurricane
storm
Wind mills are used for ______________
To make electricity/ to grind grains/ to draw water from ground
What happens to wet clothes exposed to the heat (the sun) and air?
They dry (the water evaporates).
Where is air?
All around us
Who needs air?
All living things
What is wind?
Air that moves.
Which instrument is used to measure speed of wind?
Anemometer
True or False: wind can help us and hurt us.
True