The tool which has allowed scientists to learn about the characteristics of Earth's layers is the:
A seismograph is a tool which is used by geologists to measure the waves of an earthquake. This is very important as the magnitude of an earthquake can be adequately measured.
As a result of this, this is a valuable tool that is used to learn the characteristics of the earth's layers as they are well investigated and recorded so that when a fault in the earth occurs, it can be easily identified.
Therefore, your answer is option B
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