# Inside Earth Chapter 2 Earthquakes Seventh Grade Science Flashcards

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1. Which stress pushes a mass of rock in opposite directions?
Tension
2. Which stress pulls a mass of rock in opposite direstions?
Compression
3. In normal and reverse faults, which part of the fault lies below the other part?
footwall
4. Which stress produces reverse faults?
Compression (pushes together, and makes HW go upwards)
5. Which stress produces reverse faults?
compression
6. Which stress produces normal faults?
Tension
7. What stress produces strike-slip faults?
Shearing
8. What is a fold in a rock that bends up?
Anticline (Why are your antics starting up again!?)
9. What is a fold in a rock that bends down?
Syncline (Go with the flow, you're too riled up! Just quite down)
10. Which type of fault has little of no up or down movement?
Strike-slip
11. What stress causes a block of rock to get thinner in the middle?
tension
12. What stress causes a block of rock to get thicker in the middle?
Compression
13. What type of fault may form if there is compression?
A reverse fault
14. What type of fault may form if there is tension?
A normal fault
15. What type of fault may form if there is shearing?
Strike-slip
16. What type of stress occurs at a divergent boundary?
Tension
17. What type of stress occurs at a convergent boundary?
Compression
18. What type of fault occurs at a transform boundary?
Shearing
19. What is the point beneath the Earth's surface where rock under stress breaks, triggering an earthquake?
Focus
20. Which type of wave arrives at the surface first and moves by compressing an expanding the ground like an inchworm?
Primary (P) waves
21. Which type of wave arrives at the surface second and moves by vibrating from side to side or up and down?
Secondary (S) waves
22. What are S waves also called?
Secondary waves
23. How does the speed of the surface waves compare to the speed of the S or P waves?
Slowest
24. What does a seismograph record?
Seismic waves
25. In what direction do seismic waves carry the energy from the earthquake?
Away from the focus
26. Which rating system estimates the total energy released by an earthquake?
The Moment Magnitude Scale
27. Which weismic waves travel along Earth's surface and produce the most severe ground movements?
Surface waves
28. What happens days or months after a large earthquake?
aftershocksÂ
29. If the coast guard warns of a giant wave approaching the shore as a result of an earthquake what are they referring to?
A tsunami
30. What type of building is designed to reduce the amount of energy that reaches a building during an earthquake?
A base isolated building (and a flexible and less rigid one)
31. Why is the risk of an earthquake high on the Pacific coast of the US?
It is on a fault line
32. What is the best way to protect yourself during an earthquake?
Drop, cover, and hold
33. Why can't geologists predict earthquakes?
Because they can't determine when and where the friction on a fault will be released
34. What is the process where violent shaking turns soft loose soil into liquid mud?
liquifaction
35. What is an earthquake that occurs after a larger earthquake?
an aftershock
36. How do geologists determine earthquake risk?
By locating where faults are active where earthquakes have occured in the past
 Author: Anonymous ID: 186129 Card Set: Inside Earth Chapter 2 Earthquakes Seventh Grade Science Flashcards Updated: 2012-11-29 22:08:07 Tags: Inside Earth Chapter Two Earthquakes Seventh Grade Science Flashcards Folders: Description: Made 11/29/12, quiz 12/5/12 Show Answers: