A Porhyritic Texture Indicates That the Rock or Rock Body

Multiple Choice

A porhyritic texture indicates that the rock or rock body

A) initially cooled slowly, then more rapidly.
B) initially cooled rapidly, then more slowly.
C) cooled slowly, becoming enriched in silica.
D) cooled rapidly, composition staying the same.
E) has a history too complex to make any of the above statements.