(Solved): Some mineral grains have well-formed crystal faces. Did the circled grains form before or after the ...

Some mineral grains have well-formed crystal faces. Did the circled grains form before or after the finegrained glass that surrounds them? (Hint: This is a challenging question that requires you to think carefully about the relationship between grain size and environment of formation of an igneous rock as well as the rock's geologic history, i.e., sequence of events to form this rock.) Select one: a. The circled coarse grains formed due to slow cooling deep underground after the fine-grained glass that formed due to fast cooling at the Earth's surface. b. The circled coarse grains formed due to fast cooling at the Earth's surface after the fine-grained glass that formed due to slow cooling deep underground. c. The circled coarse grains formed due to slow cooling deep underground before the fine-grained glass that formed due to fast cooling at the Earth's surface. d. The circled coarse grains formed due to fast cooling at the Earth's surface before the fine-grained glass that formed due to slow cooling deep underground.