Lava lakes are large volumes of molten lava, usually contained in volcanic craters. These lakes can be formed from one or more vents in a crater that erupts enough lava to partially fill the crater or atop a new vent that erupts lava continuously for a period of several weeks or more and slowly builds a crater progressively higher than the surrounding ground.
Lava lake in Nyiragongo, in a molten state
By Cai Tjeenk Willink (Caitjeenk) – Own work, CC BY-SA 3.0, Link
Lava lake in Erta Ale, Ethiopia
By Hervé Sthioul – Own work, CC BY 2.5, Link
Lava lake in Marum crater, Ambrym, in the archipelago of Vanuatu
By Geophile71 (Own work) [CC0], via Wikimedia Commons
Lava fountains in the Halemaʻumaʻu lava lake, Kīlauea, Hawaii
Public Domain, Link
Kilauea Lava Lake
By U.S. Geological Survey from Reston, VA, USA (Kilauea Lava Lake) [CC0 or Public domain], via Wikimedia Commons
Aerial view of the perched lava lake in Puu OO crater, Hawaii
By Hawaiian Volcano Observatery USGS (http://hvo.wr.usgs.gov/kilauea/update/images.html) [Public domain], via Wikimedia Commons
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