Author Question: Thermal convection movement in the upper mantle A) generates the electric current that powers ... (Read 64 times)

ericka1 · **on:** Jul 29, 2018

Thermal convection movement in the upper mantle

A) generates the electric current that powers Earth's magnetic field.
B) greatly influences Earth's surface features.
C) heats Earth's core by frictional forces.
D) is usually negligible.

Question 2

Earth's core is probably composed of

A) silicate minerals.
B) aluminum oxides.
C) an iron-nickel alloy.
D) calcium magnesium sulfate.