Three different mechanisms of melting rock and forming magma are: Group of answer choices a. decreasing pressure, adding

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Three different mechanisms of melting rock and forming magma
are:
Group of answer choices
a. decreasing pressure, adding fluids or volatiles, adding
heat,
b. increasing pressure, decreasing fluids or volatiles,
decreasing heat,
c. increasing pressure, adding fluids or volatiles, increasing
heat,
d. decreasing pressure, decreasing fluids or volatiles,
decreasing heat.