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Iron oxide copper gold (IOCG) deposits are considered to be metasomatic expressions of large crustal-scale alteration events driven by intrusive activity. The deposit type was first recognised by discovery and study of the supergiant Olympic Dam copper-gold-uranium deposit (Olympic Dam mine), and South American examples.
Natural sources originated either from biology or deposits of nitrates produced by atmospheric reactions. Nitrogen fixation by industrial processes like the Frank–Caro process (1895–1899) and Haber–Bosch process (1908–1913) eased this shortage of nitrogen compounds, to the extent that half of global food production now relies on ...
SARS-CoV-2 Variant; Alpha: Scientifically accurate atomic model of the external structure of SARS-CoV-2. Each "ball" is an atom. General details; WHO Designation
As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal.
This list of Boeing B-17 Flying Fortress operators is a list of users who flew and operated the Boeing B-17.. The B-17 was among the first mass-produced four-engined heavy bombers.
The decay scheme of 60 Co and 60m Co.. The diagram shows a simplified decay scheme of 60 Co and 60m Co. The main β-decay transitions are shown. The probability for population of the middle energy level of 2.1 MeV by β-decay is 0.0022%, with a maximum energy of 665.26 keV.
This is a list of countries by external debt: it is the total public and private debt owed to nonresidents repayable in internationally accepted currencies, goods or services, where the public debt is the money or credit owed by any level of government, from central to local, and the private debt the money or credit owed by private households or private corporations based on the country under ...
The 15:17 to Paris is a 2018 American biographical drama film produced and directed by Clint Eastwood and written by Dorothy Blyskal, based on the 2016 autobiography The 15:17 to Paris: The True Story of a Terrorist, a Train, and Three American Heroes by Jeffrey E. Stern, Spencer Stone, Anthony Sadler, and Alek Skarlatos.