Answer:
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
I begin and have no end. Eventually, I will be the ending of all that has begun. What am I?
I turn everything around but I cannot move. When you see me you see you!
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.