3. Convection in the Mantle
I. Types of Heat Transfer
A. Radiation
B. Conduction
C. Convection
II. Convection Currents
III. Convection Currents in the Mantle
Convection in the Mantle

4. What We Want To Know What causes the plates to move?
THE answer to this question we believe is: convection currents in the mantle.
animation

5. Convection
Convection- heat transfer by the movement of currents within a fluid
Caused by differences of temp. and density within the fluid

6. Convection Currents in Earth
1. What is the heat source?
2. What is flowing?
Heat from the core and the mantle itself causes convection currents in the mantle.
Google Image Result for

7. Convection Currents in the Earth
Animation
As the convection currents move through the mantle, it causes the plates to move in the lithosphere.

8. Science Starter: WED WK6
Along with increasing density, what force will help a convection current fall back towards the core?
Science Starter: WED WK6

9. Welcome To Science Plate Tectonics Test will be Friday
For WEDNESDAY: Graham Crackers and White Frosting for extra credit
Welcome To Science

10. What does this map show you?
Tectonic Plate Boundaries
What does this map show you?

11. Tectonic Plate Boundaries
3 Types
What direction they move?
What features & processes their movements cause?
Tectonic Plate Boundaries

12. Today’s Objectives 1. Complete Convection Experiment
2. Begin the final section
Today’s Objectives

13. Tectonic Plate Boundaries

14. Types of Plate Boundaries
Divergent Boundary- 2 plates move apart
Most DB’s are at mid-ocean ridges.
On land DB’s form deep valleys called rift valleys
Fig Evolution of a Divergent Plate Boundary
Types of Plate Boundaries

15. Divergent Boundary

16. Convergent Boundary 2 plates collide
The more dense plate will subduct under the less dense plate
Common Features
1.Mountains
2. Volcanoes
3. Deep-Ocean Trenches
Convergent Boundary

17. Types of Convergent Boundaries

18. Types of Convergent Boundaries

19. Types of Convergent Boundaries

20. 2 plates slip past each other in opposite directions.
Transform Boundaries = Earthquakes
Observe animations of processes that occur along plate boundaries.
animation
Transform Boundary

21. Subduction at Trenches
Deep-ocean trench- underwater canyon where ocean crust sinks into the mantle.
Subduction- process by which ocean crust sinks beneath a deep-ocean trench and back into the mantle
Subduction Animation - Earthguide Online Classroom

22. Matching Game Convergent boundary Sea-floor spreading Plate tectonics
land masses have slowly moved over time
Plates move on top of asthenosphere
Two plates slip past each other in opposite directions
Happens at divergent boundaries, allows magma to rise to the ocean floor
Two plates collide with each other
Two plates separate with each other
Matching Game
Convergent boundary
Sea-floor spreading
Plate tectonics
Continental drift
Divergent boundary
Transform boundary