Answer:
I am an odd number. Take away a letter and I become even. What number am I?
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
I fill a room but take no space.
When I come in from sea to shore twenty paces you'll see No less no more.
Cold head and feet; round as a ball; always turning around myself.
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.