Answer:-What is the difference between Pahoehoe and Aa lava? Pahoehoe lava is smoother and flows faster than Aa lava. Aa is much slower and hardens into a jagged surface while pahoehoe lava hardens into a smooth surface. The lava is identical in both pahoehoe and aa lava flows, the difference comes from the amount of lava erupted and the speed of cooling. Pahoehoe lava flows are produced from a small amount of lava that moves slowly, while aa flows usually are associated with a large volume of lava that moves swiftly. Aa lava flows form when basalt lava flows down the side of a volcano and is cooler than pahoehoe lava flows. The lava flow has a rough or rubbly surface with sharp edges. 'A'ā (pronounced "ah-ah") is a Hawaiian term for lava flows that have a rough rubbly surface composed of broken lava blocks called clinkers. The incredibly spiny surface of a solidified 'A'ā flow makes walking very difficult and slow.