Pencil lead is made of _____.
A) gypsum
B) galena
C) coal
D) lead
E) graphite
Correct Answer:
Verified
Q47: The major iron ore minerals are _.
A)
Q48: Uranium is found in _.
A) quartz and
Q49: The energy return on energy invested (EROEI)
Q50: Although technically not coal, the first material
Q51: The ore-forming process of _ occurs as
Q53: Most copper ores are _.
A) oxides
B) pegmatites
C)
Q54: The United States has established a permanent
Q55: Phosphate is produced from _.
A) igneous rocks
B)
Q56: Gas hydrate contains _.
A) asphalt
B) natural gas
C)
Q57: The ratio of the amount of energy
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