Which type of metamorphism occurs exclusively at lower pressures?
A) Regional metamorphism occurs exclusively at lower pressures.
B) Contact metamorphism occurs exclusively at lower pressures.
C) Hydrothermal metamorphism occurs exclusively at lower pressures.
D) All three types of metamorphism occur exclusively at lower pressures.
Question 2
How might hydrothermal ore genesis occur?
A) Hot seawater rushes through porous rocks and crystallizes on contact with the rocks.
B) Cold seawater meets hot circulating hydrothermal fluids and precipitation occurs.
C) Two rock masses meet at a hydrothermal vent and the heat of the water dissolves ions from both masses. They recrystallize when they are carried to cooler water.
D) Hot water from a hydrothermal vent dissolves ions from one rock mass and reprecipitates them as ore in cooler water.
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