Answer:
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
I fly when I'm on and float coming off.
Bright as diamonds, loud as thunder, never still, a thing of wonder. What am I?
What gets wetter as it dries?
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.