Meaning & use
aa
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a type of lava that forms a rough, jagged, and broken surface as it cools.
See it in a sentence
The hikers had to cross a field of sharp aa before reaching the crater's rim.
Aa contrasts with pahoehoe, the smoother, ropy type of lava found on the same volcano.
A note on using this word
Borrowed from Hawaiian, this geological term is normally written without special accent marks in English scientific writing.
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