The explosion crater Hverfell or Hverfjall in the Myvatn area. The Hverfell, also known as the Hverfjall, is a cone volcano in northern Iceland in the Myvatn area. Both names mean hot-springs mountain. The volcano was formed about 2500 years ago in a few days. The ejected lava cooled down almost immediately by water, making the annular volcano almost entirely composed of fins, ash and fine gravel. The volcano is 312 meters high, has a crater with a diameter of about 1 kilometer and is 140 meters deep. In the middle of the crater lies a small asheuvel. The crater wall is climbed through two not too difficult roads and a walk around provides beautiful views of Lake Myvatn. To avoid damaging the tighter structure of the volcano, do not leave the footpaths. On earth there are only few volcanoes of this type: a second (Lúdent) is located next to the Hverfell; A third, a little bit smaller, Diamond Head, is located in Hawaii.
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