Answer:
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
What goes through towns and over hills but never moves?
You can see it everyday, but cannot touch it at will. What is it?
What is brown and sticky?
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
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.