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1. The theory of Plate Tectonics

2. How Plates are able to move

3. What happens at the margins of Plates

4. The position of Ireland in relation to plate boundaries now and in the past

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The lithosphere is divided into large, rigid sections called plates.  Plates float on the Athenosphere, the semi-molten section of the mantle.
The movement of these plates and the activities that result from it is called plate tectonics.

The Theory of plate tectonics combines two earlier ideas:

1. continental drift

2. sea-floor spreading

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There are seven major plates and several minor plates.  They move slowly as they float on the Athenosphere.  As a result, they collide, separate and slide past each other.  Most earthquakes, volcanoes, oceanic trenches and mountain building occur at plate boundaries.  See below .

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TASK 1.

Watch the video below and explain the three types of plate boundaries and give an example.
Extra information available on pages 11 of the textbook Geography Today 1.

TASK 2.

Draw a diagram of each of the three plate boundaries as seen in diagram figure 2.4 on page 11.

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Tectonic Plates and Earthquakes | Motion Graphics | Pixeldust Studios

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Plate
Plate Tectonics
Continental Drift
Sea-Floor Spreading
Plate Boundary
Transform Boundary
Divergent Boundary
Mid-Ocean Ridge
Convergent Boundary
Subduction
Ocean Trench
Volcanoes
San Andreas Fault
Earthquakes
Active Plate Margin
Trailing Plate Margin

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Convection current example : East Africa- Arabia

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Convection current example : East Africa- Arabia

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Test yourself on a long question after this video.  Remember for 30 mark question you need 15 SRP's each carrying 2 marks each.

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This video introduces Pangaea and how countries related to each other in the past.

The plates have not always been in their current locations. The Earth did not always have seven continents, it was a super-continent called Pangaea, which was surrounded by one ocean.

About 200 million years ago Pangaea began to break up and form plates, as they moved so did the continents, this process is known as continental drift.

Scientists believe in another 250 million years they will join together to form a new different super-continent.