AA lava

A Hawaiian term for lava that has a rough, jagged, spiny, and often clinkery surface. In thick aa flows, the surface comprises rubble composed of loose, rough lapilli and blocks that generally hides a thick, more massive flow interior (Tilling et al., 1987). The thickness of the surface crust of aa lavas is controlled by cooling (Kilburn, 2000, p. 291).

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

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