Make tongs out of sticks and see if you can lift small objects with them.
Watch water when it boils, and tell where the steam comes from.
Where does it go? Hold a cold plate over the steam and see what happens. Where do the drops of water on the plate come from?
When water stands in the open air, what becomes of part of it?
Why do we hang clothes out on the clothes-line to dry?
What becomes of the water that was in the clothes?
Tell what you think happens just as clouds form. See if you can do something that will show what happens at the time.
What happens to the clouds just as it begins to rain?