In Bowen's reaction series, as a magma gradually cools:
a. calcium-rich plagioclase reacts continuously with the magma to become more sodium rich
b. sodium-rich plagioclase reacts continuously with the magma to become more calcium rich
c. biotite reacts discontinuously with the magma to form olivine
d. muscovite reacts discontinuously with the magma to form quartz
a
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