What Am I Riddles

Question: I can bring tears to your eyes; resurrect the dead, make you smile, and reverse time. I form in an instant but I last a life time. What am I?

Question: What always eats but is always hungry?

Question: I'm round at the ends and high in the middle.What am I?

Question: My food and drink were left behind
by ancients from another time.
I grind my feet upon the earth
with strength come from a metal hearth.
My mind is trapped when I run free
when still, it wanders far from me.

What am I?

Question: What goes up, lets out a load, then goes back down?