Answer:
What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.
What is lighter than what it is made of?
Used left or right, I get to travel over cobblestone or gravel. Used up, I vie for sweet success, used down, I cause men great duress.
I can be written, I can be spoken, I can be exposed, I can be broken.
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?