Pāhoehoe (Hawaiian) lava flow - basaltic lava that has a smooth, billowy, undulating, or ropy surface.It doesn't take much imaginiation to see how this lava stream moved and then just stopped while cooling down.
Brittle lava formations along the trail
The tiny red Desert Indian Paintbrush (Castilleja angustifolia) is one of the first plants that grows on the lava rocks at Craters of the Moon National Monument and Preserve near Arco, Idaho