From: jimp@gonzo.specsol.net   
      
   Popping Mad  wrote:   
   > If the center of the earth would have 0 force do to gravity (all the   
   > Gravity cancels out) then why is it that the deeper you go into a plant,   
   > like Jupiter for example, the pressure increases and the center of a   
   > star, when it forms, ignites into nuclear fusion?   
      
   Pressure and gravity are not the same force.   
      
   Pressure is the result of mass that is above you.   
      
   Gravity is the result of mass that is around you.   
      
   On the surface of the Earth all the mass above you is air and the   
   pressure because of the weight of that air is about 14 psi. As you   
   descend into the Earth there is more and more massive stuff above you   
   pushing you down and the pressure goes up.   
      
   As you descend into the Earth the vector sum of gravity changes. You   
   now have mass above you pulling you up. The gravity thus decreases.   
      
   The simplist way to put it is that as you go down, the gravity of the   
   stuff above you cancels the gravity of the stuff below you but the   
   weight of stuff above you is always increasing.   
      
   --   
   penninojim@yahoo.com   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)