CHAPTER 5: Earth dynamics

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Presentation transcript:

CHAPTER 5: Earth dynamics

Lesson 1: forces that shape earth

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

Vocabulary Isostasy Subsidence Uplift Compression Tension Shear Strain

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?

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

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

Plate Tectonics and the Rock Cycle

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

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