Grade 12 Geography Unit 1 : Major Geological Processes Associated with Plate Tectonics

This unit explains the theories of continental drift and plate tectonics and shows how the movement of lithospheric plates shapes the Earth’s surface. You will also study the types of plate boundaries, major geological processes, and their effects on human life.

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Chapter 1.1 – Continental Drift Theory

• Alfred Wegener’s theory of continental drift.
• Evidence supporting the theory (fossils, geology, climate).
• Early criticisms and controversies.

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Chapter 1.2 – Plate Tectonics Theory

• Development of modern plate tectonics.
• Structure of the lithosphere and asthenosphere.
• Movement of plates over geological time.

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Chapter 1.3 – Plate Movements and Plate Boundaries

• Main types of plate boundaries:
  • Divergent (constructive) boundaries.
  • Convergent (destructive) boundaries.
  • Transform boundaries.
• Triple junctions and their importance.
• Driving and retarding forces that influence plate motion.

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Chapter 1.4 – Major Geological Processes

• Earthquakes and volcanoes.
• Mountain building (orogeny).
• Formation of continents and ocean basins.
• Impact of geological processes on human lives.

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Learning Outcomes

By the end of this unit, you will be able to:

• Explain the continental drift theory and controversies around it.
• Describe the movement of lithospheric plates.
• Identify the main types of plate boundaries and their interactions.
• Explain forces influencing plate motion.
• Relate plate movements to the formation of continents.
• Discuss the effects of geological processes such as earthquakes and volcanoes on human life.