The viscosity of magma is lowered by ____________.
A) increasing temperature
B) decreasing crystal content
C) decreasing SiO2 content
D) all of the choices 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
Q7: Why does the magma from some volcanoes
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
Q14: The dominant volcanic gas (commonly 90% or
Q16: A shield volcano has a great _.
A)height
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