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block lava

noun

, Geology.
  1. basaltic lava in the form of a chaotic assemblage of angular blocks; aa.


block lava

noun

  1. volcanic lava occurring as rough-surfaced jagged blocks
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of block lava1

First recorded in 1910–15

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Block Islandblock letter