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Answer (1 of 7): The outer core (between ~1220 km to ~3400 km from the Earth’s center) is theorized to be liquid, while the inner core (less than 1220 km from the center) is solid. This is based on seismic data, where the inner ore has been observed to reflect seismic waves.

What is the major difference between the inner core and the outer core? - Quora

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Why is Earth's molten, metallic core important to humans living today? - Quora

How big are the solid center of all the gas giant planets? - Quora

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Is the Earth's core solid, liquid, or something else? - Quora

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