Spreading centres are an ideal location for volcanism because ________________.
A) they sit above the high-temperature asthenosphere
B) the asthenosphere rock has low percentages of SiO2
C) the oceanic plates pull apart causing hot asthenosphere rock to rise and undergo decompression melting to form magma that continues to rise
D) all of the choices are correct
E) none of the choices are correct
Correct Answer:
Verified
Q1: The viscosity of magma is lowered by
Q2: When magma cools so quickly that crystallization
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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