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Things You Thought You Knew - Earth’s Spinning Core
StarTalk Radio
How Do You Know All This?
4min Snip
00:00
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Earth has a solid iron core center that's surrounded by a liquid core outer. As you keep going further down, the pressure is so high that it's compactified into a solid. This means the solid core is kind of independent of the rest of the planet. Once you find the epicenter, which is not too hard, you can triangulate on it. You know what else gives you these data? Underground nuclear tests. They are especially valuable Geophysically because you know exactly where the test occurred.
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