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Volcanoes occur where they do because of the position of the crust over a plate boundary or a 'hot spot' in the Earth's mantle.
Continental volcanoes form when subducted crust melts to magma against the mantle, then is forced upward under pressure through cracks in the rocks above.
Sea volcanoes occur where the oceanic crust is heated from below as it moves over a "hot spot" in the mantle. The liquefied rock is pushed up into the ocean, where it solidifies, notably into a volcanic atoll or island. The islands of Hawaii have all formed from the same hot spot as the crust moved generally NW over millions of years.
Volcanism is also present at divergent plate boundaries, which may be located at mid-ocean ridges, or rifts on continents. The pulling apart of two plates at these locations causes rift volcanism and the upwelling of melting decompressed asthenospheric mantle material, creating new crust.
What else can I help you with?
Where do volcanoes occur the most?
The most volcanoes occur around the Pacific Ocean, in an area called the Ring of Fire.
Are volcanoes in jungles?
volcano can occur any where....
Why do volcanoes occur at conservative plate margins?
after earth
Do volcanoes occur in hot countries?
Volcanoes can occur in hot countries, but they are not exclusive to them. Volcanoes are often found along tectonic plate boundaries where magma from the Earth's mantle can reach the surface. This can happen in both hot and cold regions.
Where do volcanoes occur most frequentley?
Volcanic eruptions occur only in certain places and do not occur randomly. ... Volcanoes occur most frequently at plate boundaries
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 in oceans and earthquakes occur on land?
Earthquakes and volcanoes both occur in land and ocean. =)
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.
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
Can volcanoes occur underwater?
Yes and a great many of the earth's volcanoes are underwater.
What types of Volcanoes can occur far from any plate boundaries?
Shield volcanoes may occur far from any plate boundaries.
Where do valcanos usually occur?
Volcanoes occur on tectonic plate boundaries
Earthquakes and occur at plate boundaries?
Volcanoes
