One of the mysteries of the English language finally explained.
Basaltic lava forming very rough, jagged masses with a light frothy texture.Often contrasted with pahoehoe
- ‘A serpentine flow meanders through formations of smooth pahoehoe lava and rough aa lava, the same forms common in basalt lavas.’
- ‘Very different from jagged aa, pahoehoe is the other general texture of newly solidified lava.’
- ‘Roads of black ash traverse it, winding through the otherwise untraversable aa.’
Mid 19th century: from Hawaiian 'a-'a.
3(in the UK and South Africa) Automobile Association.
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