s the molten rock which lies underneath volcanoe
magma
some magmas begin to crystallize as they reach the surface. High temperature minerals are formed as magma slowly cools down followed by low temperature minerals.
crystal content
isa measure of a fluid’s resistance to flow.
viscosity
reflects the melting points of their mineral components.
temperature
Magma contains small amounts of dissolved gas (water vapor, Carbon dioxide, etc.) which is released as pressure is remove
volatile content