Since S Seismic waves cannot go through liquids, what interior layer of the Earth did we discover must be liquid? A. Crust B. Mantle C. Outer core D. Inner core
C. Outer core
The correct answer is C. Outer core.
To arrive at this answer, we can use the information provided in the question about seismic waves. Seismic waves are generated by earthquakes and other geological activities, and they travel through the layers of the Earth. Scientists have discovered that there are two main types of seismic waves: P (primary) waves and S (secondary) waves.
P waves are compressional waves that can travel through both solids and liquids, whereas S waves are shear waves that can only travel through solids. When seismic waves pass through the Earth, they can be refracted, reflected, or absorbed depending on the properties of the materials they encounter.
In the case of S waves, they cannot pass through liquids. Therefore, if S waves do not propagate through a particular layer, it indicates that the layer is liquid. By studying the behavior of earthquake waves, scientists have determined that S waves are unable to pass through the outer core, suggesting that it must be in a liquid state.
Hence, the correct answer is C. Outer core.