Have a look at this.
Nick posted it below a day or so below.
http://users.bigpond.net.au/Nick/Mars/Hoffman_Ice_Towers.pdf
Space/Science » in reply to To those who were hoping to find 'active' hot-springs on Mars...
Nick posted it below a day or so below.
http://users.bigpond.net.au/Nick/Mars/Hoffman_Ice_Towers.pdf