Answer:
I go up and down at the same time. Up towards to sky and down towards the ground
Take off my skin I won't cry but you will. What am I?
The Titanic is still here. What am I?
I am full of holes but still hold water. What am I?
I pass before the sun but make no shadow. 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.