Answer:
Angels and pilots work with me.
I am clean when Iām black dirty when Iām white.
It rows quickly with four oars but never comes out from under its own roof. What is it?
I cannot be bought, cannot be sold, even if I'm sometimes made of gold. What am I?
u always follow me but I am rarely seen
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.