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Aluminum is an abundant (2) metal (1) that has many uses (3). It comes from (4) bauxite, an ore (5) that resembles clay (6). Bauxite contains aluminum (7), as well as several (8) other substances (9). Workmen grind (11) the bauxite and put (12) it into pressure (13) tanks to extract these other substances (10). These substances are filtered (16) to (1) form a mass (14). After removing (15) the mass, a liquid remains (17). This is put through severl other processes (18) to finally yield a chemical (19). This chemical is a white (21), powdery (20) mixture (23) called alumina (22). It contains oxygen (25) and aluminum (24). Workmen use electricity (27) to produce a metal (28) by separating the aluminum from the oxygen (26). Thie metal is light (29), bright (31), silvery (32), lustrous (30), and comes in many forms (33).
Missing: Added IUs: Content errors: # 1 "filtered to form a mass" [Note that the infinitive of purpose -- "to extract these other subtances" -- is here inappropriately repeated. The filtering removes, not forms, the mass.] |
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