 If Vesuvius is part of the obtaining state of affairs Vesuvius’s being a volcano, the state of affairs must by the transitivity of part-of contain the parts of solidified lava that are parts of Vesuvius. But if the state of affairs contains the solidified lava as parts, it must have a weight and an extension etc. However, the state of affairs Vesuvius’s being a volcano is not a thing that has weight etc.