Which is not a factor that leads geologists to expect that convection in the mantle is likely?
A) Viscosity in the lithosphere is high.
B) Viscosity beneath the lithosphere is lower because the rock is close to its melting temperature.
C) Some of the lithosphere is denser than the asthenosphere.
D) The thickness and mass of the mantle are huge.
Question 2
Which combination of factors would best lead to convection?
A) low viscosity, low mass, and low heat conductivity
B) high viscosity, high mass, and high heat conductivity
C) low heat conductivity, low mass, and high viscosity
D) low viscosity, low heat conductivity, and high mass
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