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A.Word.A.Daywith Anu Garg
noun: Lava having a rough surface.
From Hawaiian ʻaʻā (to burn). Earliest documented use: 1859.
Aa is one of the two kinds of lava typically found in Hawaiian volcanoes. The other kind is pahoehoe, one with a smooth, ropy surface.
“The type of lava most prevalent on Bartolomé Island is aa lava; it has a lower temperature and less gas content, which makes for a slower flow, which causes broken flows and sharp edges.”
Ilene Cox; One More Day in the Galapagos Islands; Redlands Daily Facts (California); Sep 25, 2005.
See more usage examples of aa in Vocabulary.com’s dictionary.
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