Lava

Stromboli volcanic eruption

Molten pahoehoe toe

Pahoeoe fountain

Pahoehoe, Hawaiian smooth lava

Lava fountain within Villarica's crater

Old A'a flow

Old pahoehoe flow

Lavacicles in cave

Dripstone in cave

Lava tree mold

Lava tube

Lava bomb from Hekla (Iceland)

Lava squeeze-up in Capulin Volcano National Monument, New Mexico, USA

A pietracannone or petrified tree