Answer:
What has three ways out and just one way in?
A hole leading in, a hole leading out, we connect to a cavern that is slimy all throughout. What are we?
What goes around the world and stays in a corner?
Salty water everywhere but not sea in sight.
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.
Brings the sky a lot closer.