Multiple Choice
Spreading centers 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.
Correct Answer:
Verified
Correct Answer:
Verified
Q1: The dominant volcanic gas (commonly 90% or
Q2: Why does the magma from some volcanoes
Q4: At oceanic spreading centers,magmas are rhyolitic in
Q5: _ are steep-sided,symmetrical volcanic peaks built of
Q6: When magma nears the surface,gases come out
Q7: At a depth of 20 miles,basaltic
Q8: If lava reaches the sea or a
Q9: Basaltic magma has the lowest viscosity,so more
Q10: Eruptions in Hawaii are always peaceful.
Q11: Hot spots occur only under oceanic plates.