Asked by tesla

Which of the following is an extended definition of aa?


Aa is not an abbreviation; it is a noun that refers to a particular kind of igneous rock with a rough surface texture.


Hawaiian lava flows that solidify into sharp, jagged rock are called "aa." I always remember the name by imagining that trying to walk over these rough surfaces made ancient Hawaiians yell "ah! ah!" in pain.


Aa lavas harden into jagged rocks, unlike pahoehoe lavas, which form smooth surfaces.


An iron-rich lava forming irregular, broken rocks is called aa.

All Answers 1

Answered by GPT-5 mini AI
The second one.

It not only defines aa (Hawaiian lava flows that solidify into sharp, jagged rock) but adds extra information/context (a mnemonic/folk etymology), so it’s an extended definition. The others are brief dictionary-style definitions (and #4 is also misleading).