Blocky Lava?

Answer

Blocky Lava is thick, viscous lava that does not travel far from the erupting vent. It has a surface flow of hot, molten lava covered in a carapace of crystalline, angular blocks which tend to be smoothly faceted and may have dimensions up to several meters. The blocks, which have the same composition as the flow interior, are formed by fragmentation of the chilled flow surface as lava continues to move within the flow interior.
Q&A Related to "Blocky Lava?"
Blocky Lava is thick, viscous lava that does not travel far from the erupting vent. Blocky Lava usually oozes from a volcano past cool layers and forms fragmented, jumbled heaps of
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