Why do magmas rise toward Earth's surface? Magmas are mainly liquid and contain dissolved fluids such as water; most are less de
nse than the adjacent solid rock. Most magmas are richer in silica than most crustal and upper mantle rocks. Magmas are more viscous than solid rocks in the crust and upper mantle. all of the above
Metamorphism is the transformation in the existing rock type and means a change in the form when the rocks are subjected to changes in heat and pressure.
Regional metamorphism is also called dynamic metamorphism and foliation occurs when a rock s shortened along the axis during recrystallization. Such as mica, the foliated rocks is a product of the stress that deforms the rocks along the plane.
