Hills?

Don't the roots of trees go deep into soil? Five feet of soil adds
another 7 psi. I could see how hollow hills would be light unless
they had to support 5 or 10 ft of soil for trees.

--- In spacesettlers@yahoogroups.com, "Combs, Mike"
> From: flymuffins [mailto:flyingmuffins@y...]
>
> > I believe that 7 psi is similar to O'Neil's figures.
> > But all of the artwork in his book has rolling hills
> > and trees inside the habitat.
> > How much would these weigh?
>
> The trees wouldn't really weigh all that much compared to houses or
> small buildings.
>
> Consider that the hills might well be hollow, with the space
inside used