Answer:
Where do fish keep their money?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
Golden treasure I contain guarded by hundreds and thousands. Stored in a labyrinth where no man walks Yet men come often to seize my gold. By smoke I am overcome and robbed then left to build my treasure anew.
I can be swallowed But I can also swallow you.
I make a loud noise when changing jacket. I become bigger and delicious.
Give it food and it will live, give it water and it will die.