It is also known as "smooth, unbroken lava". It is characterized by low viscosity, a large amount of gas contained in small bubbles, and is usually basaltic in composition. As this type of lava cools, it forms a glassy coating as its exterior cools rapidly. Its interior, however, is still moving, causing the surface of the lava flow to wrinkle, resembling tightly bound strings. These are usually twisted and contorted, never forming a smooth surface.
Tunnels and caves formed within pahoehoe lavas are common.
