blocky lava

GLOSSARY OF VOLCANIC TERMS
Lava flows that are characterized by highly fractured surfaces which contain fragments of debris (usually flow fragments) up to several meters in diameter. The size of the surface fragments in blocky lavas is controlled by the rheology of the lava in the interior of the flow (Kilburn, 2000, p. 291).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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