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Mohammad Modassir Mushtaque
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Posted 5 year ago
Mohammad Modassir Mushtaque 
The first word in many English dictionaries, ‘aa’ is a noun, which is used to describe a volcanic rock. More specifically, it refers to ‘a block of lava with a rough or jagged surface’, and the word itself has an Hawaiian origin. Although rarely used in everyday conversation, ‘aa’ is a term used more frequently by those who study geology.
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