Hverfjall (also known as Hverfell) is a tephra cone or tuff ring volcano in northern Iceland, to the east of Mývatn.
It erupted in 2500 BP in the southern part of the Krafla fissure swarm.[1] The crater is approximately 1 km in diameter.[2]
https://en.wikipedia.org/wiki/Hverfjall
uploaded 02 апр, 2018 Copyright by Merphy Sergei
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