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Basalt fan structure
Additional recommended knowledgeA basalt fan structure is a basalt formation composed of columnar jointed basalt columns that have slumped into a fan shape. They are most likely created when basalt lava is intruded into a soft material, such as loose volcanic ash, which is unable to support the intrusion. As the basalt cools and forms columns, the ash collapses, causing the lava spread and form a fan shape. The formations can be vertical or any degree of horizontal. |
| This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Basalt_fan_structure". A list of authors is available in Wikipedia. |
