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Every second counts when a big earthquake hits. As soon as an earthquake sensor picks up the tremor, warnings can be sent over the internet, much faster than the shake travels through the Earth. And now, scientists have found a way to detect big earthquakes fast, maybe even before the ground starts to shake!

If you journeyed to the centre of the Earth, what would you see on the way down? After breaking through the crust there’s the mantle, a layer of mostly solid rock that constantly flows like a glacier. Below that, there’s the outer core made of liquid iron and nickel. Then you come to the inner…