Why are hexagonal basalt columns?
Category: Question and Answer
Updated: 2019/10/18
Views: 741 
Likes: 145
Views: 741 Likes: 145
Reference Answer
Columnar basalt only crystallizes within a lava flow, slowly cooling in a more unusual way. ... When cooling rates are fairly uniform, with the heat from the lava escaping at regular intervals, it contracts and fractures fairly evenly, leading to tall, well-developed, generally hexagonal basalt columns.
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