Obsidian, a variety of volcanic glass, may be black, dark gray, red, or brown, depending on the presence of iron.
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Q6: Plutons originate through _ activity.
A)extrusive igneous
B)extrusive volcanic
C)igneous
Q7: Many geologists now think that hot-spot volcanism
Q8: Pyroclastic igneous rock forms from _.
A)explosive volcanic
Q9: Magmas with the highest percentages (> 65%)of
Q10: Melting of Earth's crust yields mostly silica-rich
Q12: Mafic lava tends to be fluid, whereas
Q13: Partial melting of oceanic crust and silica-rich
Q14: The process of assimilation excludes any incorporation
Q15: Basalt and gabbro are compositional equivalents, which
Q16: Batholiths are large plutonic bodies produced by
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