12. Which rock is a coarse-grain equivalent of basalt? (same composition but intrusive) A. Diorite B. gabbro C. granite D. pumice 13. Igneous rock that cools very quickly when it forms may have a texture that is A. smooth and shiny with no visible grain. B. multicolored and banded. C. coarse grained. D. made up of jagged grains. 14. When we describe igneous rocks as phaneritic and aphanitic we are referring to A. composition B. texture C. origin D. rate of cooling 15. Plutonic when they form the surface while volcanic when they form surface. A. beneath, beside B. above, below C. beneath, above D. above, beside
