4ac27b7e$1@news.povray.org...
> Warp wrote:
>
>>   Its curious how common this island shape seems to be. I guess it has
>> something to do with volcanism.
>
> It's probably a coral attol.
>
> Volcano rises from the sea bed, coral grows on the part just below the 
> water's surface, volcano sinks back below the waves, coral grows upward as 
> fast the the volcano sinks downways. A few million years later... weird 
> circular island.
>
> -- 
> http://blog.orphi.me.uk/
> http://www.zazzle.com/MathematicalOrchid*

This one looks more like a caldera http://en.wikipedia.org/wiki/Caldera

Marc

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