The loess hills are a formation of wind-deposited loess soil in the westernmost or Iowa and Missouri along the Missouri river
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It's directly south of the United States.
Extremely hot, forms in mantle, known as lava in surface, contains dissolved gasses
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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.
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The answer is C. it used a micro chip
