Study Guide D11 to D14

12. How can an earthquake make a tsunami?

• P waves travel slower than S waves, and a giant wave forms.

• An underwater earthquake releases energy that pushes water into giant waves.

• S waves release more energy than P waves, and a giant wave forms.

• Tectonic plates move away from each other, and a giant wave forms.

13. What is a seismograph?

• 
• 
• 
• 

14. What is a seismogram?

• 
• 
• 
• 

15. What is a seismometer?

• 
• 
• 
• 

16. What is an earthquake’s focus?

• It's where tectonic plates slide past each other.

• It's directly above where the earthquake starts and is where the earthquake is the STRONGEST.

• It's directly above where the earthquake starts and is where the earthquake is the WEAKEST.

• It's where the earthquake starts beneath tectonic plates.

17. What is an earthquake’s epicenter?

• It's where tectonic plates slide past each other.

• It's directly above where the earthquake starts and is where the earthquake is the STRONGEST.

• It's directly above where the earthquake starts and is where the earthquake is the WEAKEST.

• It's where the earthquake starts beneath tectonic plates.

18. When do the P waves start?

• Approximately 0 seconds

• Approximately 30 seconds

• Approximately 60 seconds

• Approximately 90 seconds

18. When do the S waves start?

• Approximately 0 seconds

• Approximately 30 seconds

• Approximately 60 seconds

• Approximately 90 seconds

20. What is the time difference between the P and S waves in seconds?

• Approximately 45 seconds

• Approximately 60 seconds

• Approximately 95 seconds

• Approximately 125 seconds

21. Round the time difference to the nearest minute.

• It's about 1 minute.

• It's about 1.5 minutes.

• It's about 2 minutes.

• It's about 3 minutes.