IN: What force, do you suppose causes the plates to move?

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Presentation transcript:

IN: What force, do you suppose causes the plates to move? Plate Tectonics 10/06/15 7-3 pgs. 177-180 IN: What force, do you suppose causes the plates to move?

Sea-Flooring Spreading

Convection Hot material deep within the Earth rises while cooler material near the surface sinks. This is what causes tectonic plates to move around.

Convection

Ridge Push / Slab Pull

Ridge Push The process by which an oceanic plate slides down the lithosphere- asthenosphere boundary.

Slab Pull The process by which the edge of the oceanic plate sinks and pulls the rest of the tectonic plate with it.

Plate Tectonics The theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the athenosphere.

Tectonic Plate Boundaries There are 3 main types. Convergent boundaries Divergent boundaries Transform boundaries

Convergent Boundaries Collide When two tectonic plates push into one another.

Convergent Boundaries 3 types: Continental/Continental Continental/Oceanic Oceanic/Oceanic

Continental/Continental Forms mountains

Continental/Continental Forms mountains

Continental/Oceanic Forms land volcanoes

Oceanic/Oceanic Forms ocean volcanoes and islands

Subduction Zones The region where oceanic plates sink down into the asthenosphere.

Divergent Boundaries Divide When two tectonic plates move away from one another.

Divergent Boundary Remember sea-floor spreading?

Transform Boundaries Slide When two tectonic plates slide past each other horizontally.

Transform Boundary Produce Earthquakes! San Andreas Fault

Tracking Motion GPS satellites

OUT: When convection takes place in the mantle, why does cooler material sink, while warmer material rises?