when temperature stays the same but the pressure decreases.
occurs in rift valleys, mid-oceanic ridges, and in volcanic hotspots
When volatiles or gaseous substances are added into the hot solid rocks.
Water vapor and CO2 will react with the rocks and weaken or break their bonds
and cause it to change from solid to liquid state. Occurs in subduction zones
The melting of surrounding rocks caused by very hot magma bringing in
additional heat a very hot magma (1200�C) from the upper mantle could
rise and cause the melting of rocks in the lower crust .Occurs in rift
valleys, mid-oceanic ridges, hotspots, and subduction zones
The melting temperature of rocks that is lower than the melting
temperature of its constituent minerals.
When certain minerals are melted during the start of melting by rocks.
A process when magma is separated from rock that has not undergone
complete melting.