In the Formation of Gneiss from Granite,the Distinctive Compositional Bands

Multiple Choice

In the formation of gneiss from granite,the distinctive compositional bands form due to ____________.

A) crystals migrating within the rock
B) crystals dissolving, and atoms and ions migrating and reorganizing as new crystals
C) crystals melting, with new crystals solidifying in color bands
D) the bizarre and seemingly unknowable nature of the blueschist metamorphic facies