Answer:
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
Salty water everywhere but not sea in sight.
It's got twists and turns, but has no curves. Twist it to fix it, turn it to ruin it. What is it?
Not a burden for its weight and daily carried out, He who takes it wishes it had never come about
What can stand in place of a country but still fold away in a drawer?
I am your mother's brother's only brother in law. Who am I?