Answer:
I am a seven letter word. I am very heavy. Take away two letters from me and you will get eight. Take away one letter from me and you will get 80. What word am I?
People buy me to eat but never eat me. What am I?
At night I come without being fetched, and by day I am lost without being stolen. What am I?
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
You throw me out when you use me and take me in when you are done.
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.