Answer:
What tree that definitely grows does not have a shadow and does not grow fruit?
A box without hinges, lock or key, yet golden treasure lies within.
A great mysterious place that the bold have been known to journey into.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
White fat and fluffy, May even look like a puppy. Seems heavy but is light, Floats about without a worry, But if it turns dark you have to hurry!
What is so fragile that saying its name breaks it?