__________ eruptions are the most violent types of explosive eruptions.
A) Icelandic-type
B) Vulcanian-type
C) Plinian-type
D) Hawaiian-type
E) Pompeiian-type
Correct Answer:
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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
Q19: Rock may melt by _.
A)lowering the pressure
Q20: Mineral growth in magmas at the
Q21: _ eruptions are common first phases in
Q22: The number of "hot spots" worldwide is
Q24: Crater Lake,Oregon,fills the caldera of _ which
Q25: A mantle hot spot has generated a
Q26: Gas bubbles decrease in number and volume
Q27: On 20 February 1943,a new volcano,a scoria
Q28: Water circulating at thousands of feet
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