Answer:
What surrounds the world, yet dwells within a thimble?
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
Break it and it is better, immediately set and harder to break again.
Salty water everywhere but not sea in sight.
What can run but canβt walk?
Why is the letter B always cool?