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/ˈɑː.ɑː/ · noun
(volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe..
We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.
Cooling and solidification frequently takes a different course [...] in lava flows, producing the clinker-like ‘aa’ lava.
Both pahoehoe and aa lava flows are common on the upper slopes of Mauna Loa with a preponderance of aa flows found at the lower elevations.
Use aa when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Aa means (volcanology) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe..
Common synonyms include associate in arts, alcoholics anonymous.
The opposite depends on the specific sense.
We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers.
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