CCEA GCSE Geography Unit 1 Theme D The Restless Earth: plate tectonics, earthquakes, volcanoes and a contrasting case study

What this theme demands

The Restless Earth is the fourth of the four physical themes in Unit 1 Understanding Our Natural World, and is worth a quarter of the unit. It is the theme of tectonic hazards: it begins with the structure of the Earth and the plate margins that explain where hazards occur, then studies earthquakes and volcanoes in turn, and finishes by comparing how earthquakes affect richer and poorer countries. This overview ties the dot-point pages together and shows how the resource-based paper rewards each skill.

The building blocks of the theme

The theme builds from the foundation of plate tectonics outwards.

• Plate tectonics and plate margins. The layered Earth, continental versus oceanic crust, convection currents, and the four margin types.
• Earthquakes. Cause, focus and epicentre, measurement, effects, and the three Ps of management.
• Volcanoes. Formation, shield versus composite types, effects, why people live near them, and monitoring.
• A contrasting case study. Why earthquakes of similar magnitude have very different effects in countries at different levels of development.

Margins explain everything

The single most useful idea in the theme is that the type of plate margin controls the hazard. Constructive and destructive margins and hotspots have volcanoes; collision and conservative margins have earthquakes but no volcanoes. Every earthquake and volcano question is easier once you can name the margin and reason from how the plates are moving. Link the hazard back to the margin and a description becomes an explanation.

The skills the paper rewards

Theme D tests all three assessment objectives. AO1 is the Earth's structure, the margin types, and the causes of earthquakes and volcanoes. AO2 is explaining hazards and evaluating management, especially comparing richer and poorer countries. AO3 is the skills: reading a map of plate boundaries and interpreting hazard data and diagrams in the resource booklet.

Check your knowledge

A mix of recall questions covering the whole theme. Attempt them, then check the solutions.

1. Name the three main layers of the Earth. (3 marks)
2. What drives the movement of tectonic plates? (1 mark)
3. At which margin do you find earthquakes but no volcanoes, with plates sliding past? (1 mark)
4. What is the difference between the focus and the epicentre? (2 marks)
5. Name the scale used to measure the energy released by an earthquake. (1 mark)
6. Give one difference between a shield and a composite volcano. (2 marks)
7. Give two reasons people live near volcanoes. (2 marks)
8. Name one method used to monitor a volcano. (1 mark)
9. Why do similar earthquakes have very different effects in different countries? (2 marks)