Energy in South Australia and trap in the deeper heat. Due to the low permeability of granite, the hot rocks must undergo hydraulic fracturing and be stimulated to allow a flow of water through the system to produce energy. This heat is slowly conducted to shallower rocks near the surface. Petratherm propose developing the geothermal energy in the more permeable sedimentary rocks that overlay the hot granite, a process called Heat Exchange Within Insulator (HEWI). While somewhat cooler, in many cases they do not require hydraulic fracturing. It is estimated that one percent of geothermal energy shallower than five kilometres below the earth's surface
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