From: Jeff Shultz 

On Fri, 21 Jan 2005 12:26:53 -0500, Monte Davis wrote:

> "Geo"  wrote:
>
>>and how do we know this?
>
> Mostly from topography determined by radar. Where on Earth you get
> vulcanism concentrated along plate boundaries ("ring of
fire" etc), pretty
> much all of Venus shows "hot spot" distributions  -- like
the Siberian or
> Deccan traps here, where subsurface heat melted through the interior of
> plates. Ergo, Venus seems to be (or be much closer to) one global
"plate."
>
> -Monte

Hey, don't forget the Columbia Basalts!

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