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 in the few last remaining dry parts of town. The flood dike the Air Force built around the runway managed to keep the river from inundating the runway and GILA. Efforts are currently underway to help Galena rebuild, with the assistance of the Federal Emergency Management Agency and volunteer groups. Galena is located at (64.740643, -156.885462). Galena is located on the north bank of the Yukon River, east of Nulato. The Innoko National Wildlife Refuge is southwest of Galena. According to the United States Census Bureau, the city has a total area of , of which, of it is land