What sort of technologies is used to find out about the different layers of the Earths crust?
On the surface, scientists use high-tech tools to “listen” as seismic waves travel through Earth from a variety of sources, for example, from earthquakes and huge human-made explosions. What makes the seismic waves useful to a geophysicist is that the waves zip through Earth at different speeds, depending on what they’re traveling through. For example, the sound waves travel fast through solids, like the crust on Earth’s surface. That’s because solids have more molecules packed tightly together to transfer the sound waves from one molecule to the next. But some waves slow down or fade out when traveling through liquids, like the semi-liquid mantle, explains Ronald Cohen, a geophysicist at the Carnegie Institution of Washington. By listening to the seismic-wave patterns, scientists can determine which layers of Earth are solid or liquid, and even what minerals or metals those layers are made of. Actually i extracted all this from my source, so all credit should go to it! Hope this helps
