Answer:
It's usually found dried, but often kept slicker. Above another need, it's said to be thicker. What is it?
Salty water everywhere but not sea in sight.
What surrounds the world, yet dwells within a thimble?
He has married many women, but has never been married. Who is he?
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boon One empty, and one full.
I can only be played on a windy day