Hot dry rock geothermal energy Hot dry rock geothermal energy Hot dry rock (HDR) is an abundant source of geothermal energy available for use. A vast store of thermal energy is contained within hot - but essentially dry - impervious crystalline basement rocks found almost everywhere deep beneath the earth’s surface. A concept for the extraction of useful amounts of geothermal energy from HDR originated at the Los Alamos National Laboratory in 1970, and Laboratory researchers were awarded a U.S. patent covering it. Although often confused with the relatively limited hydrothermal resource already commercialized to a large extent, HDR geothermal energy is very different. Whereas
Live from the Underground from mainstream publications, the album received an average score of 78, based on 23 reviews. "Spin" named the album the eleventh best hip hop album of 2012. The album debuted at number five on the US "Billboard" 200, with first-week sales of 41,000 copies in the United States. As of August 2012, the album sold 83,000 copies in the United States. All tracks produced by Big K.R.I.T. Sample credits Credits for "Live from the Underground" adapted from AllMusic. Live from the Underground Live from the Underground is the debut studio album by American rapper and record producer Big K.R.I.T.. It