Uranium ore support a neutron-mediated chain reaction). Uranium, thorium, and potassium are the main elements contributing to natural terrestrial radioactivity. Uranium has the highest atomic weight of the naturally occurring elements and is approximately 70% denser than lead, but not as dense as tungsten, gold, platinum, iridium, or osmium. It is always found combined with other elements. Along with all elements having atomic weights higher than that of iron, it is only naturally formed in supernova explosions. The primary uranium ore mineral is uraninite (UO) (previously known as pitchblende). A range of other uranium minerals can be found in various deposits. These
Galena, Alaska place along the Tanana and Yukon Rivers. The Galena high school boys' and girls' basketball teams were regional champions from 2004 to 2007. The boys' basketball team won the state championship in 2008. "Frostbite," a character from the G.I. Joe 3.5" action figure toy line, is from Galena. In Metal Gear Solid, the character of Colonel Campbell announces to Solid Snake that two F-16 fighter jets have been dispatched from Galena as part of a diversionary tactic. Galena, Alaska Galena () ("Notaalee Denh" in Koyukon) is a city in the Yukon-Koyukuk Census Area in the U.S. state of Alaska. At