A very strong wind is called

Wind makes the fan of  a ___________ move.

Air contains  _________ particles.

While  sleeping  we should  keep our face

We should  keep  our doors  and  windows

Impure air  harms

We need _______ to breathe.

________makes  the air  fresh and pure.

The  percentage  of  oxygen  in the air  is about

We need  air to