Answer:
I have cities but no houses I have mountains but no trees I have water but no fish. What am I?
Kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all. What am I?
What can travel around the world while staying in a corner?
What can go up a chimney down but canโt go down a chimney up?
I save lives on the ground and in the air. What am I?
No matter how little or how much you use me, you change me every month.