Hot dry rock geothermal energy makes use of hot fluids found naturally in basement rock; but such HWR conditions are rare. By far the bulk of the world’s geothermal resource base (over 98%) is in the form of basement rock that is hot but dry—with no naturally available water. This means that HDR technology is applicable almost everywhere on earth (hence the claim that HDR geothermal energy is ubiquitous). Typically, the temperature in those vast regions of the accessible crystalline basement rock increases with depth. This geothermal gradient, which is the principal HDR resource variable, ranges from less than 20 °C/km to over 60 °C/km,
Notes from the Underground (creative writing paper) Notes from the Underground (creative writing paper) Notes from the Underground is a creative writing free newspaper. Its first issue was distributed on the London Underground and in shops and libraries throughout London on 17 December 2007. It aims to function as a quality alternative free newspaper to those on the tube. It was inspired by the success of thelondonpaper but aims to be an entertaining and accessible platform for up-and-coming writers and illustrators. Most of the stories are by new writers, though several more famous authors have written new stories for the paper. These include "The Dreams of Bethany