Answer:
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
I have a small hill with seven holes.
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
I have a frame but no picture. I have poles but not standing up
What comes once in a minute twice in a moment but never in a thousand years?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.