chr### [at] gmxde (Christoph Hormann) wrote in
<3941F368.E9FFD86D@gmx.de>: 

>I found two links for better understanding:
>
>http://cyberfair.gsn.org/Nespelem/Basalt_Columns_.html
>http://home.t-online.de/home/realschule.linz.rhein/basalt.jpg

Also take a look at 
http://www.interknowledge.com/northern-ireland/ukiant01.htm
and the many other web sites with pictures of Giant's Causeway in Northern 
Ireland.  These columns are several feet across.

-- 
Rich Allen
(Remove SPAM from my address to reply by e-mail)

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