aa
word
Definition
'Aa' is a type of rough, jagged, and solidified lava that forms after a volcanic eruption. Its surface is made up of sharp rocks and is difficult to walk on.
Usage & Nuances
'Aa' is a technical geology term, mostly used in scientific or educational contexts about volcanoes. It contrasts with 'pahoehoe' (smooth lava). 'Aa' is not used outside geology.
Example Sentences
You can tell aa apart from other types of lava because it looks really broken and rough.
natural
Tour guides warn people not to step on aa, since it can cut your shoes or skin.
natural
The volcano erupted and produced a large field of aa.
basic
Aa lava is sharp and dangerous to walk on.
basic
Scientists studied the structure of the aa flows.
basic
I've never seen aa up close, but I heard it's painful if you fall on it!
natural