how we know what inside of the center of the earth if we never been there ?
In: Earth Science
A lot of the information is gained from seismology. Just like an ultrasound scan, if an earthquake happens at one point in the Earth, the various waves coming from it reflect off layers of different density and composition and bounce back to detectors all the way round the planet. From the time different reflections get to widely spaced detectors, and how they are changed from place to place, seismologists can build up a picture of the layers.
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