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

4. OccurrencesOccurrences
More than 3 million occur
each year
About 8,000 per day, or 1
every 11 seconds
Most are extremely weak
There are three major
earthquake zones:

5. 1. The Ring of Fire1. The Ring of Fire

6. 2. Mid Ocean Ridges2. Mid Ocean Ridges

7. 3. Eurasian – Melanesian Mountain Belt

8. Major Earthquake ZonesMajor Earthquake Zones
Most earthquakes occur
along the edges of the
earth’s lithospheric plate
boundaries

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

12. BoundariesBoundaries
Convergent:
Two plates are colliding

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

15. Subduction
zone
Pacific Plate
South
America
Andes
Mountains

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