Most copper ores are ___.
A) oxides
B) pegmatites
C) placer deposits
D) sulfides
E) carbonates
Correct Answer:
Verified
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
Q52: Pencil lead is made of _.
A) gypsum
B)
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
Q58: Economic deposits of petroleum require _.
A) source
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