1. Asthenosphere, Lithosphere, Convection

2. Do Now: 6/11
What continental drift?
What is Pangaea?

3. On your Do Now, copy the diagram below and label the layers of the Earth.
Which layer of the Earth contains the continents we live on?

4. Guided Notes: 6/11 Tectonic Plates
A tectonic plate is made of the lithosphere.
The lithosphere is crust (oceanic or continental) connected to a hard rock layer below
Tectonic plates are moved by the asthenosphere
The asthenosphere is a slushy part of the Upper Mantle
--10 km
The tension between these layers caused Earth’s crust to break into enormous plates
--100 km
--200 km

5. Guided Notes: 6/11 Tectonic Plates
Lithosphere
Asthenosphere
-cooler
-hard, solid rock
-contains the crust and hard part of the mantle
-is what tectonic plates are made of
-very hot
-slushy
-causes lithosphere to break into tectonic plates
-moves tectonic plates

6. Guided Notes: 6/11 Tectonic Plates
Convection- the cycle of heat rising and cold material sinking (think of boiling water)
Works like wheels on a car
Tectonic plates move because of convection of the asthenosphere acts like wheels rolling them around

7. Drawing Assignment
1. Draw a diagram of a tectonic plate. Include both oceanic and continental crust, and arrows showing the convection of the asthenospher (Figure 8, pg. 400).
Label: continental crust, oceanic crust, lithosphere, asthenosphere, convection arrows
Make it look good! We’re putting this up in the classroom!