Answer:
I am the red tongue of the earth, that buries cities.
A young man wants to have it, but when he has it he no longer wants it. Blade in hand he attacks it And does his best to remove it. Yet he knows that it is all in vain.
Humans have two that shrink in the light and expand in the dark
What eight letter word has "kst" in middle, in the beginning and at the end?
What has fingers and a thumb but no hand?
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.