Multiple Choice
What are vesicles?
A) open voids in an igneous rock left when phenocrysts dissolved away
B) the larger mineral grains of a porphyritic texture
C) the fragments comprising a volcanic breccia
D) open spaces formed in the rock as the lava solidified around gas bubbles
Correct Answer:
Verified
Correct Answer:
Verified
Q180: Magmas are formed by partial melting in
Q181: Lava flows are typically finer grained than
Q182: Vesicles are _.<br>A)cavities or bubble-shaped holes formed
Q183: Glassy rocks can form either from extremely
Q184: Olivine is an important mineral in peridotites
Q186: Which of the following is the major
Q187: The earliest formed crystals (phenocrysts)in a magma
Q188: Examine the words and/or phrases for each
Q189: _ is the dominant feldspar in basalt.<br>A)Plagioclase<br>B)Microcline<br>C)Orthoclase<br>D)Pyroxene
Q190: Rocks that consist completely of disordered ions