Which one of the following observations is consistent with the solid nature of the Earth's mantle?
Show Hint
- S waves propagate through the mantle
- S waves do not propagate through the mantle
- P waves propagate through the mantle
- P waves are refracted in the mantle
The Correct Option is A
Solution and Explanation
Seismic waves are generated by earthquakes and can be classified into primary (P) waves and secondary (S) waves. These waves provide important information about the Earth's interior.
Step 2: Characteristics of P waves and S waves.
- P waves (Primary waves) are compressional waves that can travel through both solid and liquid materials.
- S waves (Secondary waves) are shear waves that can only travel through solids and cannot propagate through liquids.
Step 3: Analysis of S waves in the mantle.
Since the mantle is solid, S waves can travel through it. However, S waves cannot propagate through the Earth's outer core because it is liquid. This observation supports the solid nature of the mantle.
Step 4: Conclusion.
Option (B) is correct because S waves do not propagate through the mantle's outer core, which is liquid, but they do propagate through the solid mantle. Therefore, the solid nature of the mantle is consistent with the fact that S waves do not propagate through it.
\[ \boxed{\text{S waves do not propagate through the mantle}} \]
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