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 am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
What jumps when it walks, but sits when it stands?
I have four fingers and a thumb, but I'm not living. What am I?
What is 9 added to any number ending in 1