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The Theory of Plate Tectonics.  The lithosphere is divided into separate sections called plates.  The plates carry continents and ocean crust or both.

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Presentation on theme: "The Theory of Plate Tectonics.  The lithosphere is divided into separate sections called plates.  The plates carry continents and ocean crust or both."— Presentation transcript:

1 The Theory of Plate Tectonics

2  The lithosphere is divided into separate sections called plates.  The plates carry continents and ocean crust or both.

3 A Theory of Plate Motion  J.Tuzo Wilson, a Canadian scientist, combined sea floor spreading, Earth’s plates and continental drift into a single theory.  Scientific theory is a well tested concept that explains a wide range of observations.  Plate tectonics is a theory that states the pieces of Earth’s lithosphere are in constant slow motion driven by convection currents in the mantle.

4  Plate Tectonic Theory explains the formation, movement, and subduction of Earth’s plates. PLATE BOUNDARIES:  The edges of different pieces of the lithosphere meet at lines called plate boundaries.  Faults- breaks in Earth’s crust, form at boundaries.

5  There three types of plate boundaries: Transform, Divergent, and Convergent.

6 Transform Boundaries  A place where two plates slip by each other, moving in opposite directions.  Earthquakes occur at these boundaries.

7 Divergent Boundaries  The place where two plates move apart or diverge.  When a divergent boundary occurs on land a Rift Valley, a deep valley, occurs.

8 Convergent Boundary  The place where two plates come together, or converge.  When two plates collide, the plate that is most dense will sink beneath the other.

9 The Continents Slow Dance  The plates move from about one to ten centimeters a year.  The North American and the Eurasian plates move about 2.5 cm. a year.


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