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How are scientists able to determine the composition and size of earth slayers

User Jcw
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Answer:

Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions. … So, scientists study the path and speed of these waves through the earth to decipher boundaries and the materials that make up the layers

Step-by-step explanation:

User Shamara
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