A student notes that a rock contains mica and plagioclase feldspar and concludes that the rock is an intermediate rock. What piece of further information could best determine if the student's conclusion was the correct one?
A) the grain size of the crystals
B) the color of the rock
C) the amphibole content of the rock
D) the silicate content of the rock
Question 2
What process forms rocks with porphyritic texture?
A) quick cooling above ground
B) slow cooling below ground
C) a mixture of quick and slow cooling as rock moves from a warmer environment to a cooler one
D) slow cooling combined with pressure underground
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