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Plate Movement and Plate Boundaries Chapter 4, Section 3.

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Presentation on theme: "Plate Movement and Plate Boundaries Chapter 4, Section 3."— Presentation transcript:

1 Plate Movement and Plate Boundaries Chapter 4, Section 3

2 Plate Tectonics Theory Lithosphere is divided into plates Plates move around on the asthenosphere

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4 3 Causes of plate motion

5 Slab Pull Oceanic plate sinks (more dense) Pulls rest of tectonic plate with it

6 Ridge Push Oceanic crust is higher at ridge Pushes plate underneath continent

7 Convection Happens in asthenosphere Hot magma rises, cool magma sinks Drags plates sideways

8 3 Types of Plate Boundaries Convergent Divergent Transform Fault

9 Convergent Boundaries

10 Continent / Continent Plates thicken and buckle Push upwards Mountain formation

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12 Continent / Oceanic Oceanic plate sinks (more dense) Subduction zone Trenches form Volcanic mtns on coast

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14 Oceanic / Oceanic One slides under the other Subduction zones Volcanic Islands

15 Divergent Boundary Plates spread apart Magma rises New lithosphere formed Mid – Atlantic Ridge

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17 Transform Boundary Plates slide past each other Produce earthquakes

18 Types of Plate Boundaries: DivergentConvergentTransform

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21 Continent / Continent Examples Appalachian Mtns. Atlas Mtns.

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23 Continent / Oceanic Examples Andes Cascades Mt. St. Helens

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25 Oceanic / Oceanic Examples Aleutians Japan Philippines

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27 Plate Movement Approx. 3-6 cm per year Rate a fingernail grows!

28 Flash card review Flash card review


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