What does the texture of this rock indicate about its cooling history? The magma cooled:
A)entirely at the surface
B)for a while at some depth and then rose to the surface where it finished solidifying
C)slowly under relatively deep conditions
D)slowly and underwater

Question

What does the texture of this rock indicate about its cooling history? The magma cooled: 
A)entirely at the surface 
B)for a while at some depth and then rose to the surface where it finished solidifying 
C)slowly under relatively deep conditions 
D)slowly and underwater

Quizplus · Accepted Answer

The texture of the rock indicates slow cooling under relatively deep conditions. This is supported by the formation of large crystals that grew slowly over time as the magma cooled at a slower rate. If the cooling had occurred rapidly at the surface or underwater, the crystals would not have had enough time to form and the texture would be different. Additionally, if the magma had risen to the surface quickly, the crystals would have had a chance to grow but not as large as they did in this rock, indicating prolonged cooling at depth before rising.

What Does the Texture of This Rock Indicate About Its