Dark wrinkle surface on slow flowing lava river at night, active volcanic field

lava magma pahoehoe volcano molten eruption reykjanes igneous basalt seismic burning tectonic fiery mantle ominous geology geldingadalsgos earth emit excrete rock terrain ooze dark crust black surface extreme stream iceland natural glow fagradalsfjall fluid heat texture night flow field moving active effusive radiate evening slow liquid wrinkle river viscous