Lanzarote 2016 - Cueva de Los Verdes Pt 2: It is a part of a cave-system formed in the lava flow from the... (Photo: Ayasha27)
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More on VolcanoDiscovery:
: A third tectonic setting where volcanism occurs is believed to be the result of mantle plumes and not directly related to plate boundaries. So called hot spot volcanoes fall into this category.
Introduction to Plate Tectonics
: The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.