Here I am on the lava shelf looking back up from the last image. There are two different types of lava here pahoehoe (pa-hoy-hoy) and a'a (ah ah). Pahoehoe lava comes out smooth and dense and can form large areas that resemble flat parking lots or smooth bumps. A'a, on the other hand, forms individual rocks anywhere from a few inches to many feet in size. The rocks are porous and very jagged.