Answer:
I am heavy forward but backward I'm not.
My first is high my second damp my whole a tie a writer's cramp.
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
I am the kind of food monkey likes and people slip on me and fall in cartoons.
As a stone inside a tree, I’ll help your words outlive thee. But if you push me as I stand, the more I move the less I am.
What never gets any wetter no matter how hard it rains?