Aa is a type of lava that is characterized by its rough, jagged surface. It forms when lava cools and solidifies quickly, creating sharp edges and clinkers. This texture makes it difficult to walk on, as the sharp pieces can be painful to step on. Unlike Pahoehoe, which has a smooth, ropy appearance, aa lava flows are typically thicker and move more slowly. As a result, they can create steep, rugged terrain. Aa lava is commonly found in volcanic regions, contributing to the diverse landscapes shaped by volcanic activity.