Geothermal energy in the United States Geothermal Data System (NGDS). Through the NGDS, many older paper archives and drill logs that are stored at state geological surveys are now being digitized and made available for free to the public. The underground hot water and steam used to generate geothermal power may contain chemicals that could pollute the air and water if released at the surface. Hydrogen sulfide, which is toxic in high concentrations, is sometimes found in geothermal systems. Newer methods of generating geothermal power separate the hot steam collected underground from the steam used to power turbines, and substantially reduce the risk of releasing air-polluting
More Hot Rocks (Big Hits & Fazed Cookies) it was recalled and something a little more practical was compiled (ABKCO would revisit this concept with 1975's "Metamorphosis"). The result was "More Hot Rocks (Big Hits & Fazed Cookies)". Featuring the hits that could not be shoehorned onto its predecessor, as well as first-time release of many previously UK-only releases, the double album was quickly pressed and distributed into North American shops in December 1972, reaching No. 9 in the US and going gold. Like "Hot Rocks 1964–1971", "More Hot Rocks (Big Hits & Fazed Cookies)" would not see an official UK release until 21 May 1990. Allmusic's Richie