Answer:
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
When you take away the whole from me, there is always some left. What am I?
I come without being fetched at night hides away as soon as daylight strikes. Although I may look small I am much mightier than what you can imagine.
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.
I am a bow that can never be tied or broken but can disappear. What am I?
What never gets any wetter no matter how hard it rains?