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
Notes from the Underground (Hollywood Undead album) 3rd song off of "Notes From The Underground's" "Another Way Out" was the official theme song for WWE's pay-per-view event Payback on June 16, 2013. The music video for "Dead Bite" was released on August 20, 2013. Much of the music on this album remains rooted in hip-hop. Notes from the Underground received generally positive reviews from music critics. Rick Florino of Artistdirect gave "Notes from the Underground" 5 out of 5 stars, noting that it is the best album of 2013 and best album Hollywood Undead has done to date, describing that the album "practically bubbles over with intoxicating,