Multiple Choice
Fine-grained igneous rocks (grains < 1.0 mm) that have small grains cooled rapidly and are likely to be _______.
A) extrusive
B) reclusive
C) intrusive
D) obtrusive
E) preclusive
Correct Answer:
Verified
Correct Answer:
Verified
Q20: The geothermal gradient for a volcanic region
Q21: Basaltic magmas crystallize at higher temperatures than
Q22: Although batholiths may contain mafic and intermediate
Q23: Granite and _ are composed predominantly of
Q24: Ultramafic igneous rocks are composed almost entirely
Q26: A useful tool illustrating the relationships among
Q27: Extrusive igneous rocks are typically fine grained
Q28: _ are extremely coarse-grained with crystal up
Q29: Pegmatites are extremely coarse-grained igneous rocks.
Q30: Geologists regard basaltic magma (Hawaiian lava, for