Answer:
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
I have cities without people forests without trees and oceans without water. What am I?
I move without wings, between silken strings. I leave as you find my substance behind. What am I?
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
What has 88 keys, but canβt open a single door?
Give it food and it will live, give it water and it will die.