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, Indiana Galena, Indiana Galena is a census-designated place (CDP) in Floyd County, Indiana, United States. The population was 1,818 at the 2010 census. The CDP includes the town of Galena as well as the nearby town of Floyds Knobs and their immediate surroundings. Galena was originally called Germantown, and under the latter name was platted in 1837. A post office was established as Galena in 1843, and remained in operation until it was discontinued in 1933. Galena is located at (38.350585, -85.940435). According to the United States Census Bureau, the CDP has a total area of , of which is land