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How do we know the outer layer of the core is molten

How do we know the outer layer of the core is molten-example-1

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But it may surprise you to learn that, in between the solid inner core and the solid mantle, lies a liquid layer more than 2,000 kilometers thick: the Earth's outer core... The way we know that the outer core is liquid is quite brilliant: from the seismic waves produced from earthquakes.
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