Volcanoes are openings in the Earths crust that allow magma and gases to escape in an explosion.wikipedia.org Volcanoes are normally found near fault lines of tectonic plates. Volcanic eruptions normally occur when there are earthquakes.usgs.gov Volcanic eruptions can be very gentle or it can wipe out and entire planet if big enough. The more pressure from gases and magma trying to escape, the bigger the eruption. Hawaii probably has the most active volcano.nationalgeographic.com
