Clouds themselves form when air containing water vapor (an invisible gas mixed in with the air) is forced to cool.
(Clouds; form; ) (air; containing; water vapor) (an invisible gas; mixed in; with the air) (air containing water vapor (an invisible gas mixed in with the air); is forced; to cool) (air containing water vapor (an invisible gas mixed in with the air); to cool; )
Clouds air an invisible gas air containing water vapor (an invisible gas mixed in with the air) air containing water vapor (an invisible gas mixed in with the air)
form containing mixed in is forced to cool
water vapor
with the air
to cool