Hydrothermal vein deposits:
A) form when dissolved metals precipitate in a fracture in rock.
B) can yield several million dollars worth of gold and silver.
C) form placer deposits.
D) a and b
Correct Answer:
Verified
Q20: Often, early-formed minerals sink to the bottom
Q21: In a placer deposit, gold settles out
Q22: Most of the world's iron is mined
Q23: A black smoker is an example of
Q24: Mineral reserves:
A) can increase because new and
Q26: Coal reserves are thought to be sufficient
Q27: Salts (such as halite) that are left
Q28: Bauxite is an example of a:
A) disseminated
Q29: The major fuel in nuclear power plants
Q30: The color of _ is caused by
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