How We Know What's Deep Inside the Earth, Despite Never Traveling There
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The extreme conditions of inner Earth make it impossible to explore. But seismic waves during earthquakes, volcanic eruptions and light waves from the Sun all have helped reveal fascinating insights about our planet’s mantle, crust, and core.
The extreme conditions of inner Earth make it impossible to explore. But seismic waves during earthquakes, volcanic eruptions and light waves from the Sun all have helped reveal fascinating insights about our planet’s mantle, crust, and core.
![](https://i.guim.co.uk/img/media/fc6c9a618bc4374a5b2209d331a5f7472c29093b/0_504_3257_3256/master/3257.jpg?width=445&dpr=1&s=none)
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Something very weird is happening inside Earth's core
![](https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/W24DULMYURORQD5IUH5IFVMHRU.jpg)
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Earth has a hidden layer, and no one knows exactly what it is
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