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Volcanic eruptions are usually accompanied by  earthquakes. However, earthquakes may also cause volcanic eruptions.
 Earthquakes also involved much to the development of mountain ranges. When two plates move and continue to win over each other and one does not  retreat but go under the other the crust instead, is pushed up leading to the formation of mountain ranges.
The earthquake's epicenter is located on the point where the underground expulsion begins. The best relationship is shown in the pacific ring of fire wherein the largest tectonic plate is surrounded by the ring of volcanoes .

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