WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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Measurements of seismic wave speeds reveal that Earth's outer core behaves as a liquid while the inner core is solid. What physics principle causes the inner core to remain solid despite experiencing higher temperatures than the outer core?

Extreme pressure at Earth's center prevents iron-nickel atoms from melting into a liquid state The inner core is composed of ice crystals Magnetic fields cool the inner core down to sub-zero temperatures Radioactive decay absorbs all heat in the inner core

Correct Answer:

Extreme pressure at Earth's center prevents iron-nickel atoms from melting into a liquid state

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