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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.

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We have reached space. Why can't we reach the Earth's core? - Quora

What is the Earth's core? - Quora

What causes the Earth's magnetic field, and how is it related to the core? - Quora

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