Answer:
What runs around the whole yard without moving?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
Why did the computer keep sneezing?
What has a head and a tail but no body?
The warmer I am the fresher I am.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.