1. CHAPTER 5: Earth dynamics

2. Lesson 2: landforms at plate boundaries

3. ?? Essential Questions What features form where two plates converge?
What features form where two plates diverge?
What features form where two plates slide past each other?

4. Vocabulary
Ocean trench
Volcanic arc
Transform fault
Fault zone

5. Landforms Created by Plate Motion
Tectonic plates move slowly, only 1-9 cm per year
Compression, tension, and shear stresses are at work at plate boundaries
San Andreas Fault is the result of shear stresses where plates move past each other
Ural Mountains are created by compression stresses where plates collide

6. Landforms Created by Compression
Mountain Ranges
Ocean Trenches
Are deep, underwater troughs created by one plate subducting under another plate at a convergent plate
Volcanic Arcs
A curved line of volcanoes that forms parallel to a plate boundary

7. Landforms Created by Tension
Mid-Ocean Ridges
They form under water at divergent boundaries as oceanic plates move away from each other
Continental Rifts
They can form enormous splits in Earth’s crust
Large blocks of crust move downwards, creating valleys between two ridges

8. Landforms Created by Shear Stresses
Transform Faults
Where tectonic plates slide horizontally past each other
Fault Zones
An area of many fractured pieces of crust along a large fault

9. Homework Textbook: Page 162 #1, 2, 3, 5, 6 & 9
Write down question and answer
Workbook: Page