1,356 active volcanoes, of which 50 are we still do not know how long they will last. When does a volcano form? To begin with, it is necessary to know that the origin of the different volcanoes is diverse. The earth's crust is not made up of a single piece, but is divided into tectonic plates that form the surface. These plates float on top of the mantle and slide over it. One of the problems that can arise around this process is due to the fact that the tectonic plates grow . How does this occur? Between the junctions of the plates, due to the greater weakness of the terrain, lava can come out, push it and displace it.
They separate. The atlantic ocean ridge is the best example of this process. Inesem business school gis expert course geographic information system: arcgis, qgis and gvsig more information but the act does not stop there, since the effect can affect e commerce photo editing much more distant areas. Because the tectonic plates are "locked" together, if lava flow causes the plate to grow and push it in one direction, it means that somewhere else there will be an area where the plate folds, forming mountains. (himalayas), or sinks, returning to the mantle. In this part where they sink, subduction
zones, there is also volcanism, which usually occurs explosively. Etna or vesuvius are two clear examples of this process. Hot spots but there are other types of volcanoes that have nothing to do with the examples described above. They are the so-called hot spots , and the canary islands is a good example of this. Unlike what happens at plate boundaries, the hot spot is an eruption inside a plate. There are various theories as to why they appear. One of the most accepted is that there are hotter areas in the mantle that