Explanation of IU's IUs in the Original
Idea Units: Student 020
Student's Original Student'sAnalyzed

     Aluminum is an abundant (2) metal (1) that is derived from bauxite (4). When in its purest state (1), bauxite looks like clay (6). In its regular forms (2), bauxite contains aluminum (7) and several (8) other substances (9). To retrieve these substances (3), workmen grind (11) the bauxite into a powdered form (4) and put (12) it into pressurized (13) tanks. The substance that remains (1) forms a mass (14) that is extracted (15) using filtration (16) methods leaving a liquid behind. (17) The liquid is processed a couple of more times (18) and finally yields (19) a white (21), powdery (20) chemical named alumina (22). This mixture (23) contains aluminum (24) and oxygen (25). Using electrolysis (27), workmen separte (26) the aluminum from the oxygen to produce a metal (28) that comes in many forms (33) but always will have a bright (31), silvery (32) luster (30).


Missing:
# 3 "has many uses"
# 5 "ore"
# 10 "extract these other substances" [a generalization -- See # 3 Added]
# 29 "light"
Added IUs:
# 1 "When in its purest state"
# 2 "In its regular forms"
# 3 "To retrieve these substances" [statement of purpose]
# 4 "into a powdered form"
Content errors:
# 1 "that remains" [Nothing has been taken away yet.]