Imagine two magmas that are identical in all respects (for example, same temperature, pressure, volume) except that one magma has more silica than the other. Which magma will have the higher viscosity?
a) The magma with more silica will be more viscous.
b) The magma with less silica will be more viscous.
c) The magmas will have the same viscosity.
d) There is not sufficient information to establish the relative viscosities of these magmas.
e) Silica content does not affect magma viscosity.
Answer: a) The magma with more silica will be more viscous.
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