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From: Physfitfreak <physfitfreak@gmail.com>
Newsgroups: sci.physics,sci.physics.relativity,comp.os.linux.advocacy
Subject: Re: The antics of thermodynamics, the depravity of relativity, the
 bunkum of quantum
Date: Tue, 11 Mar 2025 11:46:24 -0500
Organization: Modern Human
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On 3/11/25 5:04 AM, Richard Heathfield wrote:
> 
> On 11/03/2025 09:23, Peter Moylan wrote:
> 
>> Deep underground, the pressure is so high that no voids can
>> exist. No caves, so no journey to the centre of the earth.
> That can't be right. I read a book about just such a journey. *Clearly* 
> you don't know what you're talking about!
> 


Pressure at the center of Earth is about 3.7 million atmospheres! You 
can guesstimate it by using the main three approximate densities involved:

basalt: 5 grams/cc
liquid iron: 11 grams/cc
solid iron: 13 grams/cc

The top part, basalt, is about 3000 km thick.
The middle part liquid iron is about 2000 km thick.
The core solid iron is about 1500 km radius.