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
What Is Truth What Is Truth "What Is Truth" is a single by American country music artist Johnny Cash released in February 1970. Generally viewed as a protest song, a rarity in country music at the time, the simple criticism of the Vietnam War, and war in general, as well as the stereotypical view of many politically liberal hippies made the song a major crossover hit. The song peaked at number 3 on the "Billboard" Hot Country Singles. It also became Cash's 12th Top 40 single on the Hot 100 chart, peaking at number 19, and his 2nd Top 10 single on the