How did scientists conclude/figure out that the Earth’s inner core is solid while the outer core is molten?

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How did scientists conclude/figure out that the Earth’s inner core is solid while the outer core is molten?

In: Physics

I believe it’s based on how earthquakes travel through the earth, because certain kinds travel differently in different states of matter.

The waves generated during earthquakes travel throughout the planet. If you know when and where the quake was, you can calculate how long it should take the waves to get to your monitors on the other side of the planet. Trouble was that the waves were not arriving when and where they were calculated assuming a total liquid core. Further calculations showed that the wave paths were getting disturbed by something and that something was calculated to be a solid core.

The other comments pretty much got it. Waves (like those caused from earthquakes) change direction when they travel through a material that changes density. By having precise instruments around the world measure earthquakes, they can determine the different layers of the earth.

Can someone say solid WHAT?!?