It's even cooler than that, @dbb.bsky.social! That's columnar jointing — it forms when thick lava cools, contracts, and cracks into a pattern of columns perpendicular to the cooling surface. It’s a cooling-related feature rather than flow.
Volcanologist🌋 at the British Geological Survey🏴 interested in volcanic and non-volcanic mass flows 🇨🇾🇬🇷