QQuestionGeology
QuestionGeology
"Study the graph about seismic waves.
Graph of P & S Wave Travel Times, showing travel time in minutes across distance in kilometers for P and S waves. The S wave starts at zero kilometers, zero minutes, and increases to 10,000 kilometers, 25 minutes. The P wave starts at zero kilometers, zero minutes, and increases to 10,000 kilometers, 13 minutes.
What does the graph show?
A. The S and P waves travel the same distance through Earth’s crust in the same amount of time.
B. The P wave travels through Earth’s crust more quickly than the S wave travels.
C. It takes the P wave 18 minutes to travel 6,000 km through Earth’s crust.
D. It takes the S wave 11 minutes to travel 8,000 km through Earth’s crust."
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Answer
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Step 1: Examine the given graph and compare the travel times of P and S waves for a given distance.
The graph shows that for the same distance, the P wave always reaches earlier than the S wave. This indicates that the P wave travels faster than the S wave through Earth's crust.
Step 2: Analyze the travel times for specific distances.
For a distance of 6,000 km, the P wave takes 13 minutes to travel, while the S wave takes approximately (25 / 2) minutes, which is around 12.5 minutes. Therefore, option C is not correct.
Final Answer
B. The P wave travels through Earth’s crust more quickly than the S wave travels.
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