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How Do Scientist Know About The Layers Of The Earth?

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Scientists study how fast/slow earthquake waves move to tell the earth is made of layers. The waves go slower through rock than through liquid/goop.
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Because of the seismic waves scientists were able to determine that there are different layers of the earth
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They use a seismograph to measure the layers. They see how the seismic waves change speeds while they travel 2 the Earth. O.o
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I think it is because of earthquakes
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They study volcanoes and the the waves given out during an earthquake also give them some idea of how the earth is formed
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Scientists go to place where there are volcanic eruptions. They take samples of lava and test what is in the magma.
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Because when a plate slides under one another the older more dense plate slides under the younger less dense plate then magma rises beneath the more dense plate and a volcanic arc or a volcanic island arc forms.
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Because they have this thing inside the earth that can confirm anything they want because that thing can detect lots of stuff

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