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,
Note from the Underground (Buffy comic) Note from the Underground (Buffy comic) "Note from the Underground" is a story arc that was originally published in "Buffy the Vampire Slayer" #47–50 by Dark Horse Comics and based on the "Buffy" television series. It was later reprinted in a trade paperback collected edition. Angel breaks Faith out of jail and the two of them travel to Sunnydale to help control chaos there. Angel, Faith, and Pike continue to look for Buffy, whilst the Slayer battles vampires in Hell. Buffy must continue her journey through Hell, and meets help (Angel, Faith, and Pike). It is up to them to