Answer:
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
What word becomes shorter when you add two letters to it?
What is put on a table cut but never eaten?
I break down buildings, I crumble mountains but you can't see me. What am I?
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.