dragged or subducted along plate boundaries increased temp, melt begins, adding warer oceanic crust, reverses effect of subduction zones, melting fast track

 

pull away from each other, pressure decrease 

trigger melting 

less pressure

 

pull away from each other, pressure decrease 

trigger melting 

less pressure

                     lowest lithosphere- highest asthenosphere

plumes rise, rocks melt, magma made this way through lithosphere and makes active volcanoes, surgace explesson mantle plumes - hot spot

different minerals melt  @ dif temps 

quart- low        pyroxine- high

 

 

 

more pressure, higher temp needed

 

 

 

 

help 2 lower pressure & temp

dragged or subducted along plate boundaries increased temp, melt begins, adding warer oceanic crust, reverses effect of subduction zones, melting fast track

dragged or subducted along plate boundaries increased temp, melt begins, adding warer oceanic crust, reverses effect of subduction zones, melting fast track

dragged or subducted along plate boundaries increased temp, melt begins, adding warer oceanic crust, reverses effect of subduction zones, melting fast track

dragged or subducted along plate boundaries increased temp, melt begins, adding warer oceanic crust, reverses effect of subduction zones, melting fast track