Answer:
I begin and have no end. Eventually I will be the end of all that has begun.
What is easy to get into but hard to get out of?
What can travel all around the world without leaving its corner?
When young I am sweet in the sun. When middle-aged I make you gay. When old I am valued more than ever.
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.