Answer:
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
What is the thing which, once poured out, cannot be gathered again?
A mile from end to end, yet as close to as a friend. A precious commodity, freely given. Seen on the dead and on the living. Found on the rich, poor, short and tall, but shared among children most of all.
I build up castles. I tear down mountains. I make some men blind. I help others to see.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.