Plate Movement and Plate Boundaries Chapter 4, Section 3.

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Presentation transcript:

Plate Movement and Plate Boundaries Chapter 4, Section 3

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

3 Causes of plate motion

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

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

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

3 Types of Plate Boundaries Convergent Divergent Transform Fault

Convergent Boundaries

Continent / Continent Plates thicken and buckle Push upwards Mountain formation

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

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

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

Transform Boundary Plates slide past each other Produce earthquakes

Types of Plate Boundaries: DivergentConvergentTransform

Continent / Continent Examples Appalachian Mtns. Atlas Mtns.

Continent / Oceanic Examples Andes Cascades Mt. St. Helens

Oceanic / Oceanic Examples Aleutians Japan Philippines

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