1. Aim: How do the plates of the Earth move?
Do Now:
Complete the reading “Plate Movement: In out and Sideways” from the back top bin.
Then, answer the questions on the back and complete the chart.

2. I. Causes of Plate Motion
Convection currents within the mantle push and pull the plates
(ESRT p.10)

3. Convection occurs when warm material rises and cool material sinks.
WHY?

4. II. Types of Plate Boundaries
1. Divergent boundaries form where two plates move apart (spreading).

5. • Rift valleys are found at the boundaries the divergent plates.
• Oceanic ridges are found on either side of the rift valley.

6. • Seafloor spreading produces new oceanic crust at divergent plate boundaries

7. Which type of crust sinks under the other and why?
2. Convergent boundaries form where two plates come together.
Which type of crust sinks under the other and why?
Oceanic crust sinks since it is more dense.

8. trenches mark the subduction zones on the surface.
Subduction zones are where one plate is forced down into the mantle beneath a second plate.
trenches mark the subduction zones on the surface.
Subduction zone

9. A. Oceanic Crust vs. Continental Crust
Oceanic crust sinks beneath the continental.
• Continental Volcanoes form from the rising magma. (example: Andes Mountains)

10. B. Oceanic Crust – Oceanic Crust
One of the two plates sinks under the other.
• Volcanic Islands grow out of the ocean (example: Aleutian Islands)

11. C. Continental Crust – Continental Crust
• The two plates collide and the continents being carried are forced upward.
• Mountain ranges form from the uplift of these continents (example: Himalayan Mountains)

12. 3. Transform fault boundaries form where two plates grind/slide past
each other.
They move parallel

13. Faults and fractures
Shallow earthquakes occur
- cuts and cracks.

14. San Andreas fault in California is an example of a transform boundary

15. Movement (arrows and words)
Boundary Type
Movement (arrows and words)
Features
Convergent
Divergent
Transform

16. ESRT PAGE 5