# Tectonic plates OBJECTIVES MUSTbe able to: (C-E) State and describe how the theory of plate tectonics supports Wegener’s ideas of continental drift. State.

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Tectonic plates OBJECTIVES MUSTbe able to: (C-E) State and describe how the theory of plate tectonics supports Wegener’s ideas of continental drift. State and describe the effects observed at the boundaries of tectonic plates. SHOULD be able to: (B-C ) Explain why tectonic plates move. Explain the effects observed at the boundaries of tectonic plates. COULD be able to: (A*-B) Show how the rock cycle arises from the movement of tectonic plates. Discuss the limitations of tectonic plate theory.

Layers of the Earth

Tectonic plate theory The Earth’s crust is divided up into a number of sections called tectonic plates.

The Earth in the Universe Earth's interior and plate tectonics Youtube clip

The Earth in the Universe Plate tectonics - 7 minute documentary You may want to skip the first 1 minute 10 seconds but this video also shows the 3 types of plate boundary.

Movement of Tectonic plates is caused by convection currents in the mantle.

Divergent or constructive plate boundary Divergent = moves apart Constructive = makes new plate (at the ridge)

Convergent or destructive boundary Convergent = moves towards each other Destructive = plate is destroyed

Where one plate goes under another it is called subduction.

Or this can happen at a convergent boundary.

Transform boundary

The rock cycle Watch this. This middle section is best. The rock cycle and soil creation

Tectonic plates OBJECTIVES MUSTbe able to: (C-E) State and describe how the theory of plate tectonics supports Wegener’s ideas of continental drift. State and describe the effects observed at the boundaries of tectonic plates. SHOULD be able to: (B-C ) Explain why tectonic plates move. Explain the effects observed at the boundaries of tectonic plates. COULD be able to: (A*-B) Show how the rock cycle arises from the movement of tectonic plates. Discuss the limitations of tectonic plate theory.

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