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It's amazing how we can learn things about the very depths of our planet.
What Are Seismic Waves?
Is the Earth's inner core oscillating and translating anomalously?
How do we know that the outer core of the Earth is liquid? - Quora
Giant, Previously Unknown Structure Discovered Deep Inside Earth
Seismic Waves - Earth's Structure
Earth's inner core is 'superionic', a state of matter somewhere between solid and liquid, study suggests - ABC News
Is Earth's core lopsided? Strange goings-on in our planets interior.
Seismic Evidence for Internal Earth Structure
Using seismic waves to image Earth's internal structure
Earth's innermost layer is a 400-mile-wide ball of iron, new study suggests
Study of Earth's inner core reveals a 'planet within a planet' - Study Finds