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File:Colobocentratus atratus (Shingle Urchin) on Columnar Basalt - Punaul'u Black Sand beach (2414952061).jpg

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<a href="http://en.wikipedia.org/wiki/Basalt#Columnar_Basalt" rel="noreferrer nofollow">Columnar Basalt</a>

This basalt forms in columns which are oriented vertically, with the polygons (in this case mainly hexagons) forming as the basalt cools and shrinks. A similar phenomena occurs with <a href="https://www.flickr.com/photos/atlapix/344695937/or">needle ice</a> or <a href="https://www.flickr.com/photos/brewbooks/422006861/">pipkrake</a> ice crystals. <a href="http://en.wikipedia.org/wiki/Basalt" rel="noreferrer nofollow">Basalt</a>

Colobocentratus atratus Shingle Urchin, Helmet Urchin ha'uke'uke kaupali Order: Spinulosida Family: Echinometridae Urchins with solid spines

<a href="http://en.wikipedia.org/wiki/Sea_urchin" rel="noreferrer nofollow">en.wikipedia.org/wiki/Sea_urchin</a>


1041308 047
Date
Source Colobocentratus atratus (Shingle Urchin) on Columnar Basalt - Punaul'u Black Sand beach
Author brewbooks from near Seattle, USA
Camera location19° 08′ 01.45″ N, 155° 30′ 22.46″ W Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This image was originally posted to Flickr by brewbooks at https://flickr.com/photos/93452909@N00/2414952061 (archive). It was reviewed on 2 March 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-sa-2.0.

2 March 2019

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current21:04, 2 March 2019Thumbnail for version as of 21:04, 2 March 20193,072 × 2,304 (1.16 MB)Christian Ferrer (talk | contribs)Transferred from Flickr via #flickr2commons

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