Some plutons are emplaced by forceful injection as magma moves upward through country rock.
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Q2: Laccoliths are dikes that inflate, causing the
Q3: Crystal settling involves gravitational settling of melted
Q4: When plutons begin to form and crystallize
Q5: A key characteristic of igneous rocks is
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
Q11: Obsidian, a variety of volcanic glass, may
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