Re: suppose there was an earth sized watermelon?

From: Patrick Powers (frisbieinstein_at_yahoo.com)
Date: 11/28/04 

Date: 28 Nov 2004 00:14:34 -0800

Odysseus <odysseus1479-at@yahoo-dot.ca> wrote in message news:<41A8DD1F.3DEB33DC@yahoo-dot.ca>...
> Patrick Powers wrote:
> >
> > Scott Robinson <dscottr@bellatlantic.net> wrote in message news:<b1a7q0pemprtgv0a1529tocbe73475ri0d@4ax.com>...
> > >
> [snip]
>
> > > A water planet would be hot at the center.
> >
> > I'm inclined to believe it, but then why does the ocean get colder as
> > one descends, while earth grows hotter?
>
> AFAICT it's because colder water -- down to 4°C -- is denser than
> warmer, and sinks. Great as the pressures get in the deep oceans,
> they're insignificant compared to those in the interior of a planet,
> at least as far as they affect convection &c.; I don't know how water
> behaves under extreme pressure, but I can imagine it solidifying to a
> degree, inhibiting convection and other transport mechanisms
> sufficiently to trap heat in the core. But even if so, there would
> remain a surface region where the usual regime, involving water in a
> liquid state, allows heat to be carried upward from the depths.

Water under extreme pressure: there are nine forms of water, most of
them solid, but I'm pretty sure the Earth's core is liquid. You could
look for "phase transition diagram of water" or something like that.

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