Answer:
Four leaves I have.
I jump when I walk and sit when I stand.
I am put on the table, cut, but never eaten. What am I?
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.