11. How did scientists know that the inner core is liquid and the outer
core is solid?
VAMOOI TUO vala
A. Scientists interpret the changes in the speed of seismic waves.
B. Scientists dig the Earth to find how the interior of the Earth looks
like.
C. Scientists use the Global Positioning System (GPS).
D. Scientists use the magnetic Resonance Imaging (MRI) to deter-
mine the physical properties of the Earth's interior.


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