The Alcántara River has eroded a narrow gorge into the lava erupted by the nearby Etna. The columns shown in the photo have formed due to contraction of the basaltic rocks during a slow cooling and solidification process.
The Alcántara River has eroded a narrow gorge into the lava erupted by the nearby Etna. The columns shown in the photo have formed due to contraction of the basaltic rocks during a slow cooling and solidification process.