Answer:
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
small land in water.
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.
Feed me and I live. Give me water and I die. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.