You are on vacation in San Francisco and you find a rock called a serpentinite near the Golden Gate Bridge. You remember that serpentinites are metamorphic rocks commonly found in oceanic crust
The serpentinite contains the mineral serpentine [Mg3Si2O5(OH)4], which forms by reacting water (H2O) to olivine (Mg2SiO4).
Your serpentinite formed by:
a. contact metamorphism
b. hydrothermal metamorphism
c. regional metamorphism
B
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