# Glencoe Science Level Blue

## Chapter 8: Earthquakes and Volcanoes

### P wave Travel Time

 1 P-waves travel at 8 km/s in the upper mantle. Calculate the time it takes P-waves to travel 200 km in the upper mantle. A) 50 s B) 12.5 s C) 25 s D) 43.75 s 2 P-waves travel at 6 km/s in the crust. Calculate the time it takes P-waves to travel 150 km in the crust. A) 25 s B) 12.5 s C) 30 s D) 41.7 s 3 P-waves travel at 8 km/s in the upper mantle.Calculate the time it takes P-waves to travel 350 km in the upper mantle. A) 15 s B) 43.75 s C) 25 s D) 41.7 s 4 P-waves travel at 6 km/s in the crust. Calculate the time it takes P-waves to travel 250 km in the crust. A) 33.3 s B) 12.5 s C) 41.7 s D) 43.75 s 5 P-waves travel at 8 km/s in the upper mantle. Calculate the time it takes P-waves to travel 100 km in the upper mantle. A) 40 s B) 17 s C) 25 s D) 12.5 s 6 P-waves travel at 6 km/s in the crust. How long will it take a P-wave to travel 200 km in the crust? A) 33.3 s B) 12.5 s C) 25 s D) 41.7 s 7 P-waves travel at 8 km/s in the upper mantle. How long will it take a P-wave to travel 150 km in the upper mantle? A) 33.3 s B) 15 s C) 25 s D) 18.75 s 8 P-waves travel at 6 km/s in the crust. How long will it take a P-wave to travel 220 km in the crust? A) 25 s B) 12.5 s C) 36.7 s D) 33.3 s 9 P-waves travel at 8 km/s in the upper mantle. How long will it take a P-wave to travel 440 km in the upper mantle? A) 55 s B) 25 s C) 45 s D) 75 s 10 P-waves travel at 6 km/s in the crust. How long will it take a P-wave to travel 440 km in the crust? A) 55 s B) 73.3 s C) 78.3 s D) 45 s