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Zion Johnston
Geography
13 April, 17:08
How did scientists determine earths layers?
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Sidney Atkinson
13 April, 17:33
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Scientists can tell by observing the seismic waves that are recorded all over the surface of the earth from distant earthquakes. The seismic waves are reflected (bounced off) layers of different density, and they are refracted (bent) when they enter layers of different density.
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