Most hydrothermal ores are metallic __________.
A) carbonates
B) sulfates
C) native elements
D) sulfides
E) oxides
Correct Answer:
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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)
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
Q58: Economic deposits of petroleum require _.
A) source
Q60: Gold is found in _.
A) weathered granites
B)
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