How do they know that inside the Earth it is liquid?



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    “Scientists believe that deep down inside the Earth, there’s a huge ball of liquid and solid iron. This is the Earth’s core, and it protects us from the dangerous radiation of space.” Scientists are able to prove this through seismology. For example, when earthquakes rock the surface of the Earth, the planet rings like a bell. As a result, the shockwaves pass through the center of the Earth. Monitoring stations around the planet detect how the waves bounce, and scientists are able to use this to probe the interior of the Earth.

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