Answer:
Whatβs full of holes but still holds water?
Without coolant, you'll have some trouble with this.
What is it that after you take away the whole, some still remains?
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.
What you do to determine the length of something
My days are numbered. What am I?