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 Underground underlying the gilded understanding of society is what he tells Liza will end up leading her down a calamitous path and ultimately destroy her. Where the Underground Man places himself in this messy view of society is rather complicated. He is very open about his irrational and spiteful interaction with the world, but he also admits that he understands the pleasure in "a doll to play with" or "a cup of tea with sugar in it" (these being symbols of a non-corrupted society). The important distinction here is that the Underground Man would lie awake grinding his teeth for months