Answer:
In many hall ways you would stand if not with me in hand.
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
Who is your mother's only sister's son's brother's aunt's daughter's sister's father?
I have cities with no people, forests with no trees, and oceans with no water. What am I?
I have feet on my head
What never gets any wetter no matter how hard it rains?
What am I?
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