• Take out a sheet of paper and set it up as shown below. Use the whole sheet of paper.

Divergent Convergent Transform

Type of Movement

Sketch of boundary

Landforms created

Today’s ScheduleToday’s Schedule

• 1. Schedule for the week.

• 2. Continue with Ch. 7 Section 3 Discussion

• 3. Begin work on Plate Tectonics WS

Matching GameMatching Game• 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

• Convergent boundary

• Sea-floor spreading

• Plate tectonics

• Continental drift

• Divergent boundary

• Transform boundary

Ch. 7 Section 3 The Theory of Plate Ch. 7 Section 3 The Theory of Plate TectonicsTectonics

Things you should know: what plates are, directions plates move, and some landforms that plate movement creates.

Now, you need to figure out what causes the plates to move.

Observe these demonstrations to discover Observe these demonstrations to discover the answer.the answer.

Convection• Convection- heat transfer by the movement of

currents within a fluid

• Caused by differences of temp. and density within the fluid

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 http://www.windows.ucar.edu/earth/interior/e_thermal_history_animated.gif

Plate Boundaries• Divergent Boundary- place where 2 plates

move apart or diverge.

• Most DB’s are at mid-ocean ridges.

• On land DB’s form deep valleys called rift valleys

• Fig. 19.21 - Evolution of a Divergent Plate Boundary

Convergent Boundary• Place where 2 plates come together, or

converge.

• Oceanic plate + Continental plate = subduction• Continental plate + Continental plate =mountains• OptIPuter Outreach

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

Transform Boundary

• Place where two plates slip past each other in opposite directions.

• Transform Boundaries = Earthquakes• Observe animations of processes that occur along plate boundaries.

The Big Picture

• Sea-floor spreading and subduction change the size and shape of the ocean floor.

• 200 million years for a rock to be “born” at a mid-ocean ridge, move across the ocean floor, and then sink into the mantle.

• The Pacific Ocean is sinking and The Atlantic Ocean is growing.

Plate Boundaries ContestTransform

Divergent Convergent

Assignment Points Received

Total Points Possible

1. Signed Rules & Procedures *********** 10

2. All About You *********** 5

3. Brain Pop Sci. Meth. WS *********** 10

4. Observation vs. Inference Unit1 Section 2 Notes

*********** 10

5. Sci. Meth Quiz *********** 21

6. Tootsie Pop Lab *********** 10

7. Science Pre-Test *********** 10

8. Earth’s Layers WS *********** 10

9. Ch. 7 Section 1 Quiz *********** 15

10. Pangaea Lab or Ch. 7 Section 2 Review

10

11. Ch. 7 Section 2 & 3 Outline 10