1. Plate Tectonics & Major Geological Events

2. Plate Tectonics (Review)
The Earth’s crust and upper mantle are broken into sections called plates.
The plates of the lithosphere float on the asthenosphere.
Two Types of Plates:
Ocean plates - plates below the oceans
Continental plates - plates below the continents

3. Major Plates Boundaries & Their Relative Motions

4. I CAN…
describe various landforms created by different plate movements.

5. Plate Boundaries Divergent Boundary –_____
divide
Divergent Boundary –_____
Convergent Boundary – ________
Transform Fault Boundary –________________________
collide
slide

6. Divergent Boundaries
Boundary between two plates that are moving apart or rifting
 
RIFTING causes SEAFLOOR SPREADING

7. Features of Divergent Boundaries
Mid-Ocean Ridges (Two Oceanic Plates)
Rift Valleys (Two Continental Plates)
Ocean Basins
Fissure Volcanoes

8. Mid-Ocean Ridges & Rift Valley

9. Divergent boundary of two continental plates.
Creates a __________. Example: _____________
rift valley
East African Rift

10. Ocean Basins are generated at divergent plate boundaries, but also disappear down seduction zones in convergent plate boundaries.
Continental margin
Deep-ocean basin
Submarine canyon profile (cut through continental shelf)
Sediment
Continental shelf
Continental slope
Continental rise
Oceanic ridge
Continental
crust (granitic)
Oceanic
crust (basaltic)
Asthenosphere

11. Convergent Boundaries
Boundaries between two plates that are colliding
 
There are 3 types…

12. Type 1: Ocean plate & Continental Plate
Ocean plate colliding with a less dense continental plate
SUBDUCTION ZONE: where the less dense plate slides under the more dense plate
VOLCANOES occur at subduction zones

13. Convergent boundary of an oceanic plate and a continental plate
Convergent boundary of an oceanic plate and a continental plate. Forms a _______ mountain range and a ______. Examples: _______ or _______ Mts
volcanic
trench
Andes
Cascades

14. Trenches are arc-shaped depressions in the ocean floor caused by the subduction of a converging ocean plate. Most trenches are around the edges of the active Pacific. The ocean’s greatest depth is the Mariana Trench where the depth reaches 36,163 miles below sea level.

15. Type 2: Ocean Plate & Ocean Plate
Ocean plate colliding with another ocean plate
The less dense plate slides under the more dense plate creating a SUBDUCTION ZONE called a TRENCH

16. Convergent boundary of two oceanic plates.
Creates an ________ and a _____. Example: _____
island arc
trench
Japan

17. Type 3: Continental Plate & Continental Plate
A continental plate colliding with another continental plate
Have Collision Zones: a place where folded and thrust faulted mountains form.

18. Convergent boundary of two continental plates
Convergent boundary of two continental plates. Forms a ______ mountain range. Examples: ___________, Alps, ______________
Himalayas
folded
Appalachians

19. Transform Fault Boundaries
Boundary between two plates that are sliding past each other
EARTHQUAKES along faults

20. Transform-fault boundary where the North American and Pacific plates are moving ____ each other.
Example: ________________ in California
past
San Andreas Fault

21. Plate Boundaries Review
Places where plates move apart are called _____________ boundaries.
When continental plates diverge a ___________ is formed.
When two oceanic plates converge what is created? _________________
The Appalachians formed mainly from continental plate collisions and therefore are a __________ mountain range.
The force moving the plates is ____________ .
divergent
rift valley
an island arc and a trench
folded
Convection currents