1. Opening Assignment Take handout on lab table– look at the data table on the last page to answer these questions
1. Which planet has the greatest mass? Which planet has the greatest density? Why are they not the same?
2. What is the orbital period? Answer question B on that page.
3. Answer question C -- HINT --- LOOK at the length of day…..why?

3. Plate Tectonics
Chapter 17

4. Continental Drift Wegener
_________ proposed the theory that the crustal plates are moving over the mantle.
This was supported by fossil and rock type evidence; also matching of coastline shapes.

5. Convection Currents
The force responsible for plate movement is __________.

6. Plate Boundaries
The following two slides show maps of the current major plate boundaries and their relative motions.
You should be able to describe various landforms created by different plate movements.

9. Plate Boundaries Divergent Boundary – moving _____
Convergent Boundary – moving ________
Transform Fault Boundary – moving ________________________
apart
together
sideways past each other

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

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

14. 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

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

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

20. San Andrea 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

22. The Early Earth and Plate Tectonics video
The Early Earth and Plate Tectonics - YouTube