Answer:
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
As a state in America I am round on both sides and high in the middle.
I only exist when you are here. Where you never were I can never be.
I go around in circles, but always straight ahead. Never complain, no matter where I am led. What am I?
My tail is long, my coat is brown. I like the country, I like the town. I can live in a house or live in a shed, and I come out to play when you are in bed. What am I?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?