Mount Tambora, Sumbawa, Indonesia
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The source[1] fixes the climax to the day: "the Mount Tambora eruption reached a violent climax on 10 April 1815", with smaller phreatic activity continuing for months afterwards.The most powerful volcanic eruption in recorded history threw 37-45 cubic kilometres of rock into the atmosphere from Sumbawa. Its veil of ash cooled the planet enough to give 1816 the name the Year Without a Summer.
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