Theoretical Frameworks

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The Earth's Internal Structure

The Earth can be broken down into segments such as the core, mantle, asthenosphere and lithosphere.

The core

The core is the central part of the Earth.
It is made up of an inner core and outer core.
The inner core is solid, the outer core is liquid. Both are made from iron and nickel.
The core is a source of radioactive heat.

The mantle

The mantle is a semi-molten body of rock between the Earth’s crust and its core.

The asthenosphere

The asthenosphere is part of the mantle.
The asthenosphere is semi-molten.
It is below the lithosphere, which floats on top of it.

The lithosphere

The lithosphere is the crust and upper mantle which form the tectonic plates.
Together they are 80-90km thick
The crust changes in thickness under oceans and continents.
- Under oceans, the crust is 6-10km thick.
- Under continents, the crust is 30-40km thick.

Diagram

The Theory of Plate Tectonics

Theoretical frameworks attempt to explain plate movements. There have been a variety of theories and discoveries over recent times. For example:

Wegener’s Continental Drift

Wegener’s Continental Drift hypothesis (1912) said that our now separate continents had once been joined together as supercontinents e.g. Pangea.

Holmes' Hypothesis

Holmes (1930s) said that the Earth’s internal radioactive heat was the driving force of convection currents in the mantle that could move tectonic plates.

Sea floor spreading

In the 1960s, there was a discovery of magnetic stripes in the oceanic crust of the seabed.
Palaeomagnetic signals from past reversals of the Earth’s magnetic field prove that new crust is created by the process of seafloor spreading at mid-ocean ridges.

Gravitational sliding

Elevated altitudes of oceanic crust at ridges at divergent plate boundaries – create a ‘slope’ down which oceanic plates slide (gravitational sliding).

Slab pull

At convergent boundaries, the high-density ocean floor is being dragged down by a downward gravitational force (slab pull) beneath the adjoining continental crust.

Processes at Different Plate Margins

There are four main types of process that happen at plate margins:

Processes at divergent margins

Volcanic eruptions at divergent plate margins are basaltic and produce low viscosity lava.
Earthquakes at divergent plate margins are low magnitude and shallow focus (less than 70 km deep).

Processes at convergent margins

Deep-sea trenches and fold mountain ranges often form at convergent plate margins.
Volcanic activity at convergent plate margins is often violent due to the high viscosity lava.
Earthquakes at convergent plate margins are high magnitude, deep-focus (up to 700 km deep) and frequent.
- An example of this type of plate margin can be seen in western South America.

Processes at collision margins

Collision plate margins are characterised by the meeting of two continental landmasses resulting in the formation of a fold mountain belt.
- E.g. The collision between the Indo-Australian and Eurasian plates has created the Himalayan mountain range.
There is no volcanic activity at collision plate margins.
Earthquakes at collision plate margins are rare - when they do happen, they are high magnitude and shallow-focus (less than 70 km deep).

Processes at conservative margins

There is no volcanic activity at conservative plate margins.
Earthquakes at conservative plate margins are high magnitude, shallow-focus (less than 70 km deep) and a common occurrence.
- An example of this type of plate margin is the San Andreas fault in California.

1Tectonic Processes & Hazards

1.1Tectonic Processes & Hazards

1.1.1Tectonic Plates

1.1.2Distribution of Tectonic Hazards

1.1.3Theoretical Frameworks

1.1.4Earthquakes

1.1.5Earthquake Hazards

1.1.6Volcanoes

1.1.7Tsunamis

1.1.8End of Topic Test - Tectonic Processes

1.1.9Exam-Style Question - Earthquakes

1.2Natural Disasters

1.2.1Introduction to Natural Disasters

1.2.2Impacts of Hazards

1.2.3Comparing Hazards

1.2.4Development & Governance

1.3Natural Disaster Case Studies

1.3.1Tohoku Earthquake & Tsunami

1.3.2Gorkha Earthquake

1.3.3Mount Merapi Eruption

1.4Trends & Patterns

1.4.1Disaster Trends

1.4.2Prediction

1.5Disaster Modification

1.5.1Hazard Management

1.5.2Modifications

1.5.3End of Topic Test - Natural Disasters

1.5.4Exam-Style Question - Disaster Modification

2Option 2A: Glaciated Landscapes & Change

2.1Glaciated Landscapes Over Time

2.1.1Timeline of Glacial Change

2.1.2Natural Causes

2.1.3Ice Distributions

2.2Periglacial Landscapes

2.2.1Periglacial Processes

2.2.2Periglacial Landforms

2.3Glacial Processes

2.3.1Mass Balance

2.3.2Glacial Movement

2.4Glacial Landforms

2.4.1Landscapes

2.4.2Erosional Landforms

2.4.3Erosional Landforms 2

2.4.4Erosional Landforms 3

2.4.5Depositional Landforms

2.4.6Fluvioglaciation

2.5The Future of Glaciated Landscapes

2.5.1The Value of Glaciated Landscapes

2.5.2The Value of Glaciated Landscapes 2

2.5.3Threats to Glaciated Landscapes

2.5.4Managing the Threats to Glaciated Landscapes

3Option 2B: Coastal Landscapes & Change

3.1Coastal Landscapes

3.1.1The Wider Coastal Landscape

3.1.2Geological Structure

3.1.3Lithology & Vegetation

3.2Coastal Erosion & Deposition

3.2.1Shaping Coastlines

3.2.2Coastal Formations

3.2.3Sediment Transportation

3.2.4Subaerial Processes

3.3Coastal Risks

3.3.1Sea Level Change

3.3.2Coastal Retreat

3.3.3Coastal Flooding

3.4Managing Coastlines

3.4.1Consequences of Coastal Recession

3.4.2Engineering Management Approaches

3.4.3Governance Approaches

4Globalisation

4.1Globalisation

4.1.1Intro to Globalisation

4.1.2Development of Globalisation

4.1.3Economic Policy & Globalisation

4.1.4Government Policy & Globalisation

4.1.5International Organisations & Globalisation

4.1.6Measuring Globalisation

4.1.7TNCs & Globalisation

4.1.8TNCs - Aramco & Anglo-Iranian Oil

4.2Negatives of Globalisation

4.2.1'Switched Off' Places

4.3Global Shift

4.3.1Global Shift for Developing Nations

4.3.2Global Shift for Developing Nations 2

4.3.3Global Shift for Developed Nations

4.3.4End of Topic Test - Globalisation

4.4Migration

4.4.1Megacities

4.4.2International Migration

4.4.3Country Interdependence

4.5Culture

4.5.1Global Culture

4.5.2Cultural Erosion

4.6Measuring Development

4.6.1Measuring Development

4.7Responses to Globalisation

4.7.1Tensions Caused by Globalisation

4.7.2Government Control of Globalisation

4.7.3Ethical Responses to Globalisation

4.7.4End of Topic Test - Migration, Culture, & Response

5Option 4A: Regenerating Places

6Option 4B: Diverse Places

6.1Population Structure

6.1.1The UK

6.1.2Population Characteristics

6.1.3Government & Change

6.2Past & Present Connections

6.2.1International Influence on Places

6.2.2Historic Influences on Places

6.2.3The Perception of Places

6.2.4Image & Identity

6.3Urban & Rural Spaces

6.3.1Perceptions of Urban Places

6.3.2Perceptions of Rural Places

6.3.3Evaluating Living Space

6.4Diversity

6.4.1UK Migrations

6.4.2Challenges

6.4.3Tensions & Conflict

6.4.4Wider Outcomes of Tensions

6.4.5Managing Tensions

6.5Urban & Rural Case Studies

6.5.1Stakeholders

6.6Case Study - Tower Hamlets

6.6.1Background

6.6.2Characteristics

6.6.3Issues

6.7Case Study - Sturton-le-Steeple

6.7.1Background

6.7.2Characteristics

6.7.3Issues

7The Water Cycle & Water Insecurity (A2 only)

7.1Hydrological Processes Global to Local

7.1.1Global Hydrological Cycle

7.1.2Drainage Basin Hydrological Cycle

7.1.3Water Budgets

7.1.4River Regimes

7.1.5Storm Hydrographs

7.2Influences on the Water Cycle

7.2.1Causes of Drought

7.2.2Impacts of Drought

7.2.3Causes of Flooding

7.2.4Impacts of Flooding

7.2.5Climate Change & The Water Cycle

7.2.6Impacts of Climate Change

7.2.7End of Topic Test - The Water Cycle

7.3Water Insecurity

7.3.1Water Stress

7.3.2Causes of Water Insecurity

7.3.3Water Insecurity Risk

7.3.4Conflict Over Water

7.4Water Supply Management

7.4.1Hard Engineering Schemes

7.4.2Sustainable Management

7.4.3Water Treaties & Framework

7.4.4End of Topic Test - Water Insecurity & Management

8The Carbon Cycle & Energy Security (A2 only)

8.1The Carbon Cycle

8.1.1Carbon Stores

8.1.2Carbon Stores 2

8.1.3Biological Carbon

8.1.4Atmospheric Carbon

8.1.5Burning Fossil Fuels

8.2Energy Consumption

8.2.1Consumption

8.2.2Access to Energy

8.2.3Energy Players

8.2.4Supply & Demand

8.2.5Pathways

8.2.6End of Topic Test - Carbon & Consumption

8.3Alternative Energy

8.3.1Unconventional Fuels

8.3.2Non-Fossil Fuels

8.3.3Non-Fossil Fuels 2

8.4Growing Demand for Resources

8.4.1Deforestation

8.4.2Water

8.4.3Climate Change

8.5The Future

8.5.1Future Uncertainty

8.5.2Adaptation Strategies

8.5.3Mitigation Strategies

9Superpowers (A2 only)

9.1Superpowers

9.1.1Introduction to Superpowers

9.1.2Superpowers - Economic Power & Size

9.1.3Superpowers - Political & Military Power

9.1.4Superpowers - Culture, Demography & Resources

9.1.5Geo-Strategic Location

9.2Hard & Soft Power

9.2.1Hard & Soft Power

9.2.2Emerging Powers - China Rivalry

9.2.3Emerging Powers - Chinese Sources of Power

9.2.4Emerging Powers - Brazil

9.2.5Emerging Powers - Russia

9.2.6Emerging Powers - India

9.2.7Theories of Development

9.2.8Power Case Studies: Chinese One Belt One Road

9.2.9Power Case Studies: Pakistan Nuclear Arms

9.2.10Power Case Studies: OPEC

9.3IGOs, TNCs & Alliances

9.3.1Superpowers & IGOs

9.3.2Superpowers & TNCs

9.3.3Superpowers & Global Action

9.3.4Superpowers & Alliances

9.3.5Superpowers & the Environment

9.4Changing Global Influence

9.4.1Recent Tensions between Powers

9.4.2China in Africa & Asia

9.4.3Tensions in the Middle East

9.4.4Economic Problems for Superpowers

9.4.5Future Pattern of Power

10Option 8A: Health & Human Rights (A2 only)

11Option 8B: Migration & Identity (A2 only)

11.1Globalisation & Migration

11.1.1Intro to Migration

11.1.2Trends in Migration

11.1.3Common Migration Patterns

11.1.4Causes of Migration

11.1.5Restrictions on Migration

11.2Consequences of Migration

11.2.1Intro to Culture

11.2.2Social & Demographic Tensions of Migration

11.2.3Political & Economic Tensions of Migration

11.3Nation States

11.3.1Intro to Nation States

11.3.2Borders

11.3.3Nationalism

11.4Responses to Global Migration

11.4.1Responses to Global Migration

11.4.2Global Organisations

11.4.3IGOs and World Trade

11.4.4Financial IGOs

11.4.5Environmental IGOs

11.5Sovereignty & Identity

11.5.1Sovereignty & Nationalism

11.5.2Complex Identities

11.5.3Challenges to National Identities

11.5.4Tensions within Nations

11.5.5Failed States

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