Answer:
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
I'm tall when I'm young and I'm short when I'm old. What am I?
I have wheels and flies yet I am not an aircraft.
At night I come without being fetched, and by day I am lost without being stolen. What am I?
What do you call a bear in the rain?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.