1. CHAPTER 5: Earth dynamics

2. Lesson 1: forces that shape earth

3. ?? Essential Questions How do continents move?
What forces can change rocks?
How does plate motion affect the rock cycle?

4. Vocabulary
Isostasy
Subsidence
Uplift
Compression
Tension
Shear
Strain

5. Plate Motion Mountain ranges are produced by plate tectonics
Earth’s surface is broken into rigid plates that move horizontally on Earth’s more fluid upper mantle
How are the Rocky Mountains different from the Appalachian Mountains?

6. Vertical Motion Balance in the Mantle Subsidence and Uplift
Isostasy is the equilibrium between continental crust and the denser mantle below it
Subsidence and Uplift
Subsidence is the downward vertical motion of Earth’s surface
Uplift is the upward vertical motion of Earth’s surface

7. Horizontal Motion Types of Stress Types of Strain
Squeezing stress is compression, stress that pulls something apart is tension and parallel forces acting in opposite directions are shear
Types of Strain
A change in the shape of rocks caused by stress is called strain. We have elastic strain and plastic strain
Deformation in the Crust

8. Plate Tectonics and the Rock Cycle

9. Homework Textbook: Page 154 #1, 2, 3, 4, 5, 6, 7 & 9
Write down question and answer
Workbook: Page 158, 160, 161