Aa is a type of basaltic lava flow that had angular blocks and rubble and it's surface is covered.
Aa refer to a form of Hawaiian term use to describe lava flows that are strong, rough and have rubbly surface which consist of broken lava blocks called clinkers. The piny surface of a solidified Aa flow makes walking aliitle bit difficult and slow.
Therefore, Aa is a type of basaltic lava flow that had angular blocks and rubble and it's surface is covered.
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