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Grabrok crater, Iceland

Iceland has a high concentration of active volcanoes due to the unique geological conditions of its location on the mid-Atlantic Ridge, a divergent tectonic plate boundary. The island has 30 active volcanic systems, of which 13 have erupted since the settlement of Iceland in 874 AD.[1]

Of these 30 volcanic systems, the most active/volatile is Grímsvötn.[2] Over the past 500 years, Iceland's volcanoes have erupted a third of the total global lava output.[3]

 

en.wikipedia.org/wiki/Volcanism_of_Iceland

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Taken on August 6, 2012