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Have you ever wondered where cork comes from? It comes from the bark of the Cork Oak tree (tree species name - Quercus suber). The cork bark of this species of oak tree (yes it does produce acorns) can grow to become two to three inches thick. Normally however it is harvested when it is about one or one and a half inches thick.
Because of its honeycomb-like structure, cork consists largely of empty space; its density (weight per unit volume) is one-fourth that of water. Unlike a honeycomb, however, cork consists of irregularly shaped and spaced cells having an average of 14 sides.