Answer:
What English word has three consecutive double letters?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it can neither see nor feel it. What is it?
What is the thing that stays the same size, but the more it's used the more it decreases?
In the night a mountain, in the morning a meadow.
What kind of nut is empty at the center and has no shell.
You use it between your head and your toes, the more it works the thinner it grows.