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Lava column / pillar /Columnar basalt 

Volcano Learning zone > Volcano Glossary

Giants Causeway Columnar basalt Lava columns are a feature of basaltic lava flows and form polygonal shaped columns which interlocj. They are formed when a molten basaltic lava flow cools. As the lava cools it shrinks towards a central point and forms polygonal columns of basalt.

The Giants Causeway in N Ireland is extensive area of columnar basalt formed during the rifting which created the North Atlantic Ocean.Giants Causeway N Ireland