Volcanic material which has a lower density than water is called __________.
A) Obsidian
B) Plinian rock
C) Pyroclastic bomb
D) Pumice
E) Volcanic glass
Correct Answer:
Verified
Q8: Silicon and oxygen link up to form
Q9: The volcanic explosivity index (VEI)measures size of
Q10: Rock may melt by _.
A) lowering the
Q12: In magma the most abundant dissolved gas
Q14: The dominant volcanic gas (commonly 90% or
Q14: Molten rock released at the Earth's surface
Q15: The most peaceful eruptions are _.
A) Icelandic
Q17: Hawaiian volcanoes capable of eruption include _.
A)
Q18: The three Vs of volcanology are _.
A)viscosity,volatiles,velocity
B)viscosity,volatiles,volume
C)viscosity,velocity,volume
D)volatiles,volume,variability
E)volatiles,velocity,variability
Q18: Which of the following statements about shield
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