Lava channels like these are formed when one of Etna's viscous lava flows is slowly cooling on its outer margins whilst the hit liquid lava in the centre keeps moving. (Photo: Ingrid Smet)
Lava channels like these are formed when one of Etna's viscous lava flows is slowly cooling on its outer margins whilst the hit liquid lava in the centre keeps moving. (Photo: Ingrid Smet)
Copyright: Ingrid Smet
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