1) Lake of British Columbia 2) Lake of Oregon 3) Volcanic crater feature 4) Volcanic landform
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https://www.crosswordclues.com/clue/lava-lake
Lava lakes are large volumes of molten lava, usually basaltic, contained in a volcanic vent, crater, or broad depression. The term is used to describe both lava lakes that are wholly or partly molten and those that are solidified (sometimes referred to as frozen lava lakes in this case). ==Formation== Lava lakes can form in three ways: ==Notable e...
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http://en.wikipedia.org/wiki/Lava_lake
A lake of molten lava, usually basaltic, contained in a vent, crater, or broad depression of a shield volcano.
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http://volcano.oregonstate.edu/glossary/1
Aerial view of a lava lake atop the Kupaianaha vent on the east rift zone of Kilauea Volcano, Hawai'i. The fume rising from the end of the narrow part of the lava lake marks the beginning of a lava tube. Credit: E. W. Wolfe, U.S. Geological Survey A large volume of molten lava, usually basaltic...
Found on
http://www.daviddarling.info/encyclopedia/L/lava_lake.html
A lake of lava, usually basaltic, in a volcanic caldera.
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https://www.encyclo.co.uk/local/22327
No exact match found.
