Answer:
I start new then become old. Start clean but be one dirty. I usually start big then become little.
Who keeps the ocean clean?
I am a shower that lights up the sky
I plow and plow, but never sow. What am I?
I am not alive but I can die. 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.