This clipart is a remake from a book by Hans Rudolf Lutz
"Today's Hieroglyphs", Niggli Verlag, septembre 2009
All the illustration of this book are in public domain.
Original drawing released into the public domain by Pearson Scott Foresman.
http://commons.wikimedia.org/wiki/File:Cloud_seeding_(PSF).jpg
I used rg1024's grass for the uuh, grass.