Aphanitic, phaneritic, and porphyritic are terms that indicate ____, respectively.
A)fine-grained, course-grained, and mixed grained crystal sizes
B)formation by fast cooling, slow cooling, and mixed cooling rates
C)plutonic, volcanic, and mixed plutonic-volcanic origins
D)course-grained, fine grained, and mixed grained crystal sizes
E)Mixed-grain, course-grained, and fine-grained crystal sizes

Question

Quizplus · Accepted Answer

Aphanitic rocks have fine-grained textures due to rapid cooling, often associated with volcanic activity. Phaneritic rocks are coarse-grained, indicating slower cooling typically found in plutonic rocks. Porphyritic rocks have a mixed grain size, showing two stages of cooling.

Aphanitic, Phaneritic, and Porphyritic Are Terms That Indicate ____, Respectively