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The complexity of a complete description of the physical state and properties of magmas is an outstanding challenge for the future of laboratory-based experimental investigations of geomaterials. In nature the complexity of the phase assemblage, the state of the phase boundaries and chemical heterogeneity within phases are all consequences of the relatively complicated petrogenetic history typical for magmatic systems at relatively late stages of their evolution and relatively high levels in the crust. One of the most visible consequences of high-level activity is volcanism and a series of contributions to various material aspects of the character of materials involved and the mechanisms of processes occurring in explosive and effusive volcanism are presented in this section.