Answer:
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
I keep things green and keep kids happy during summer time.
I have three feet but I cannot walk. What am I?
I am drawn by everyone without pen or pencil. What am I?
I am carried by mad animals.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic