Question: what are the three main components of magma what factors control and how the viscosity of magma?
Answer: Magma Composition: Silicate-rich magmas are typically formed at destructive plate boundaries, by partial melting and/or assimilation of crustal rocks (which are richer in silica than the rock of the mantle). ...  Temperature: ...  Volatile Content: ...  Crystal Content: ...  Experiements.