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| Q.21 | Which of the following type of waves propagate through the Earth with a speed of about 15,000 miles per hour and are the first waves to cause vibration of a building during an earthquake? | |
| Ans | 1. Both S and P waves | |
| 2. L waves | ||
| 3. S waves | ||
| 4. P waves |
Correct Ans: 4
