Elias is standing on a Transform. I had the same question and I got transform
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Look at several different sources in order to understand topics comprehensively instead of basing your reactions only on one source. Using a variety of sources can diminish the effects of bias—the preference of one view over another.
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Scientists are able to understand Earth's interior by studying seismic waves.
Seismic waves travel at different speeds when they pass through different types of material, so by studying seismograms, scientists can learn a lot about Earth's internal structure.