1. A. Part of the Earth that
consists of several large
and several small tectonic
plates.
B. Movement of a fluid due to
temperature difference.
C. Supports the Theory of
Plate Tectonics.
D. Pulling the edge of some
plates towards the center
of the Earth.
E. A theory that states the
Earth’s surface consists of
large moving plates.
1. Plate Tectonics
2. Gravity
3. Lithosphere
4. Sea Floor Spreading
5. Convection Current
E
D
A
C
B

2. ReviewReview
Plate Tectonics
Deep sea trenches
Mid oceanic ridges
Sea floor spreading

3. EarthquakesEarthquakes
A shaking of the earth’s
crust due to a release of
energy
There are three major
earthquake zones:

4. 1. The Ring of Fire1. The Ring of Fire

5. 2. Mid Ocean Ridges2. Mid Ocean Ridges

6. 3. Eurasian – Melanesian Mountain Belt

7. BoundariesBoundaries
Divergent:
Two plates are moving
away from each other
Sea floor spreading

10. BoundariesBoundaries
Convergent:
Two plates are colliding

12. BoundariesBoundaries
Subducting:
On plate is forced under
another
This is a
type of
convergent
boundary!

13. Subduction
zone
Pacific Plate
South
America
Andes
Mountains

14. BoundariesBoundaries
Transform boundary:
Sliding by one another
Not creating or
destroying land

16. Earthquake WavesEarthquake Waves
P-Waves
Primary Waves-
longitudinal waves

17. P WavesP Waves

18. Earthquake WavesEarthquake Waves
Arrive first, travel almost
twice as fast as S waves
Travel through solids,
liquids, gases

20. Earthquake WavesEarthquake Waves
S-Waves
Secondary Waves-
transverse waves

22. Earthquake WavesEarthquake Waves
•Travel through solids
only

24. Surface WavesSurface Waves
Sometimes called “L”
waves
Travel through solids only
Responsible for most
damage due to their intense
vibrations

25. Surface WavesSurface Waves
Surface
waves occur
when P and S
waves reach
the surface

26. Location of EarthquakesLocation of Earthquakes
The Focus- the breaking
point (inside the Earth)
where the vibrations
originate

27. Focus

28. Location of EarthquakesLocation of Earthquakes
The Epicenter- the
location (on the surface)
directly above the Focus

29. Locating EarthquakesLocating Earthquakes
Seismologists can figure
out earthquake locations
through trilateration

30. Fresno, CA

33. Reno, NV

36. Tonopah, NV

38. Epicenter

39. Richter Scale

40. Richter Scale

41. http://www.sciencecourseware.com/
virtualearthquake/vquakeexecute.
html
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