1. Week of January 23, 2017

2. *Sea-Floor Spreading & Convection
Monday

3. Wegener’s Theory
Everyone agreed that Wegener’s evidence was compelling, but he couldn’t provide a mechanism for continental movement.
In the 1960’s, Harry Hess used new technology and radar to make a discovery to help support Wegener’s Theory.

4. *Sea-floor Spreading
*Henry Hess discovered that the ocean floor has both trenches and mid-ocean ridges.
Trench: long ditch
Mid-ocean ridge: long mountain line
*Hess proposed that hot material below Earth’s crust rises toward the surface at the mid-ocean ridges.
*Hess’s discoveries provided a possibility for how the crust could move.

5. *Evidence Sea-floor Spreading
In 1968, scientists aboard the research ship Glomar Challenger began gathering information about the rocks on the seafloor.
*Scientists found that the youngest rocks are located at the mid-ocean ridges.

6. Age of Oceanic Crust

7. Possibility for Movement
Sea-floor spreading provided an explanation for how the continents moved.
The magma which pushes up at the mid-ocean ridge provides the new land pushing the plates.
Both Hess’s discovery and Wegener’s continental drift theory combined into what scientists now call the Theory of Plate Tectonics.

8. How does sea-floor Spreading occur?
So, sea-floor spreading exists. How does it happen?
It’s still giant slabs of oceanic and continental crust moving around… how!?

9. *Plate Tectonics
Tuesday

10. Tectonic Plates Map Directions: Cut out the map.
Glue it into your notebook as a flap.
(You’ll have to write underneath.)

11. Tectonic Plate Names Note:
You should know the names of the major plates and be familiar with the minor plates.
These names will help us discuss plate boundaries.

12. *Tectonic Plate Boundaries
Directions: Cut along the solid lines; fold along the dotted. Glue this into your notebook like a flipbook. Open the book and take notes.
Convergent Boundaries
Tectonic plates collide into each other
Often causes mountains
Called “Destructive” because crust crumbles as the plates collide
Divergent Boundaries
Tectonic plates pull away from each other
Often causes rifts
Called “Constructive” because magma reaches the surface and cools into new crust
Transform Boundaries
Tectonic plates slide past each other
Causes earthquakes and faults
Called “Destructive” because crust crumbles as the plates grind

13. Plate Tectonics in Action
Wednesday – DE Video & Video Worksheets

14. *Plate Boundaries & Landforms
Thursday

15. Divergent
Convergent
Transform

16. Above ground volcanoes in South America
Great Rift Valley in Africa
Mid-Atlantic Ridge in the Atlantic Ocean
Pulling away from each other
Continental Crust – Rift Valleys
Oceanic Crust – Sea-floor Spreading
Sliding past each other
Earthquakes
Fault Lines
San Andreas Fault in California
Colliding into each other
Indo-Australian Plate & Eurasian Plate converge to form the Himalayan Mtns.
Mountain Building
Newer
Older plate subducts under the newer.
Volcanoes
Underwater volcanoes
Older
Above ground volcanoes in South America
Oceanic crust subducts under the continental crust.
Volcanoes
Continental
Oceanic

17. BrainPop: Plate Tectonics
Friday – Video, Challenge, & Quiz (Graded)