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The concentration of copper in ores averages only 0.6%, and most commercial ores are sulfides, especially chalcopyrite (CuFeS2) and to a lesser extent chalcocite (Cu2S). These minerals are concentrated from crushed ores to the level of 10–15% copper by froth flotation or bioleaching. Heating this material with silica in flash smelting removes much of the iron as slag. The process exploits the greater ease of converting iron sulfides into its oxides, which in turn react with the silica to form the silicate slag, which floats on top of the heated mass. The resulting copper matte consisting of Cu2S is then roasted to convert all sulfides into oxides:
What happens to the silicate slag during the flash freezing process?
A: unanswerable

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Despite stiff resistance from the East India lobby in parliament and from the Company's shareholders, the Act passed. It introduced substantial governmental control and allowed British India to be formally under the control of the Crown, but leased back to the Company at £40,000 for two years. Under the Act's most important provision, a governing Council composed of five members was created in Calcutta. The three members nominated by Parliament and representing the Government's interest could, and invariably would, outvote the two Company members. The Council was headed by Warren Hastings, the incumbent Governor, who became the first Governor-General of Bengal, with an ill-defined authority over the Bombay and Madras Presidencies. His nomination, made by the Court of Directors, would in future be subject to the approval of a Council of Four appointed by the Crown. Initially, the Council consisted of Lt. General Sir John Clavering, The Honourable Sir George Monson, Sir Richard Barwell, and Sir Philip Francis.
By having 3 members on the council in Calcutta from the British Government they were always able to ____ the two EIC members?
A: outvote

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After the Nazi Party seized power in January 1933, the Länder increasingly lost importance. They became administrative regions of a centralised country. Three changes are of particular note: on January 1, 1934, Mecklenburg-Schwerin was united with the neighbouring Mecklenburg-Strelitz; and, by the Greater Hamburg Act (Groß-Hamburg-Gesetz), from April 1, 1937, the area of the city-state was extended, while Lübeck lost its independence and became part of the Prussian province of Schleswig-Holstein.
Who seized power in January of 1934?
A: unanswerable

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In 1903, Brigham Young Academy was dissolved, and was replaced by two institutions: Brigham Young High School, and Brigham Young University. (The BY High School class of 1907 was ultimately responsible for the famous giant "Y" that is to this day embedded on a mountain near campus.) The Board elected George H. Brimhall as the new President of BYU. He had not received a high school education until he was forty. Nevertheless, he was an excellent orator and organizer. Under his tenure in 1904 the new Brigham Young University bought 17 acres (69,000 m2) of land from Provo called "Temple Hill". After some controversy among locals over BYU's purchase of this property, construction began in 1909 on the first building on the current campus, the Karl G. Maeser Memorial. Brimhall also presided over the University during a brief crisis involving the theory of evolution. The religious nature of the school seemed at the time to collide with this scientific theory. Joseph F. Smith, LDS Church president, settled the question for a time by asking that evolution not be taught at the school. A few have described the school at this time as nothing more than a "religious seminary". However, many of its graduates at this time would go on to great success and become well renowned in their fields.
What were the 96,000m2 of land purchased by BYU called?
A:
unanswerable