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the oceanic crust being subducted is Basaltic. It goes through changes from pressure and temperature as it ids subducted. It goes from basalt to Amphibolite and finally at 100km depth eclogite. At the 100 km a lot of the water is forced out of the rock allowing the surrounding area to liquidize. Since it is liquid it is less dense then the solid area and rises. as it reached into the Continental or ocean crust it melts the surrounding area, and magma rises forming a volcano.
What else can I help you with?
What seasons do volcanoes occur?
volcanoes can occur in any season
Does regional metamorphism occur under volcanoes?
Yes they do occur under volcanoes
Do volcanoes occur randomly over Earth's surface?
Volcanoes do not occur randomly over Earth's surface. They occur along the located mark of plate boundaries.
What types of Volcanoes can occur far from any plate boundaries?
Shield volcanoes may occur far from any plate boundaries.
What energy transfers occur in volcanoes and earthquakes?
by killing people
Is there a hot spot or a subdution zone near mount st helens?
Mount St. Helens is near a subduction zone.
What seasons do volcanoes occur?
volcanoes can occur in any season
Does regional metamorphism occur under volcanoes?
Yes they do occur under volcanoes
What are the steps in continent mountain formation?
Continents and mountains are sometimes formed by volcanoes that occur on an arc near a subduction zone. The activity of the volcanoes can cause shifts in the plates that form mountains and lift continents.
Do volcanoes occur in oceans and earthquakes occur on land?
Earthquakes and volcanoes both occur in land and ocean. =)
What are the steps in arc-continent mountain formations?
Continents and mountains are sometimes formed by volcanoes that occur on an arc near a subduction zone. The activity of the volcanoes can cause shifts in the plates that form mountains and lift continents.
Do Hotspot volcanoes occur along subduction zones.?
No, hotspot volcanoes do not occur along subduction zones. They occur when plates pass over mantle hot spots.
Where do volcanoes occur the most?
The most volcanoes occur around the Pacific Ocean, in an area called the Ring of Fire.
What happens at deep-ocean trenches?
subdution
Volcanoes and earthquakes are likely to occur?
Yes, they are likely to occur.
Do volcanoes occur randomly over Earth's surface?
Volcanoes do not occur randomly over Earth's surface. They occur along the located mark of plate boundaries.
Where do moderate volcanoes occur?
Hawaii
