Why does the magma from some volcanoes flow smoothly and relatively peacefully,while the magma from other volcanoes blasts forth violently?
A) Differences in the chemical and mineral makeup of magmas
B) Variations in the temperature,water and gas content,and viscosity of magmas
C) Different geographic positions with respect to plate tectonic setting
D) All of these are correct
E) None of these are correct
Correct Answer:
Verified
Q2: When magma cools so quickly that crystallization
Q4: Spreading centres are an ideal location for
Q5: Slow flowing,more viscous lava commonly has a
Q6: The presence of water _ the melting
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
Q16: A shield volcano has a great _.
A)height
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