+Aa is a common type of [lava flow](/wiki/Lava_Flow) characterized by a rough, jagged, and broken surface. Cooler and more viscous than [Pahoehoe](/wiki/Pahoehoe), it forms as a moving mass of rubbly blocks and fragments.
+## See also
+- [Pahoehoe](/wiki/Pahoehoe)
+- [Volcano](/wiki/Volcano)
+- [Basalt](/wiki/Basalt)
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