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Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is continuously moving?

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Presentation on theme: "Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is continuously moving?"— Presentation transcript:

1 Plate Tectonics What evidence do scientists have to support the fact that the Earths crust is continuously moving?

2 Plate Tectonics The theory that describes how tectonic plates move and shape Earths surface Tectonic plates are huge pieces of crust that fit together at their edges to cover Earths surface.

3 About 12 plates exist on Earth

4 Earths Interior Crust – Rigid outer shell of Earth –Oceanic and Continental Crust Mantle –Upper mantle is partially molten –Lower mantle is rigid (solid)

5 Earths Interior Core –Outer core is molten iron, source of Earths magnetic field –Inner core is solid, Iron and Nickel

6 Plate Boundaries Divergent Boundary Convergent Boundary Transform Boundary

7 Divergent Boundary Two tectonic plates move apart from each other Rift valleys – long narrow depressions Rift valley in East Africa

8 Convergent Boundary Two tectonic plates move towards each other (come together) Oceanic Plates are more dense Continental Plates are less dense

9 Subduction Process when one tectonic plate slips beneath another plate

10 Oceanic – Oceanic –Subduction Occurs –Deep Sea Trenches (Marianas Trench)

11 Oceanic – Continental –Subduction Occurs –Trench and Volcanic Arch (Peru – Chile Trench)

12 Continental – Continental –Mountain Building –Himalayas –Aleutian Islands

13 Transform Boundary Region where two plates slide past each other Earthquakes occur at transform boundaries San Andreas Fault in San Francisco

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