geography

Revision for Paper 2 (2025)

Igneous Rocks

  • Definition: Igneous rocks are formed from molten rock that cools and solidifies.
  • Formation: Can escape to the Earth's surface through large volcanic eruptions.
  • Examples:
    • Basalt: A common volcanic rock.
    • Granite: A common plutonic rock.

Evidence of Past Volcanic Activity

  • Example Site: Arthur's Seat.

Metamorphic Rocks

  • Definition: Metamorphic rocks are formed from the alteration of existing rocks (sedimentary, igneous) through heat, pressure, or chemical processes.
  • Characteristics:
    • Very hard and resistant to erosion.
  • Process: Heating and compression lead to the transformation into new rock types.
  • Examples:
    • Shale → Slate
    • Limestone → Marble

Sedimentary Rocks

  • Definition: Formed from sediments that settle at the bottom of lakes, rivers, or seas.
  • Sediment Types: Sand, shells, or skeletons.
  • Examples:
    • Limestone
    • Chalk
    • Clay
    • Sandstone

Chalk Landscapes

  • Often associated with sedimentary processes resulting in flat landscapes dominated by chalk deposits.

Topographical Key and Land Height

  • Key Metrics:
    • Heights in metres relative to sea level.
    • Greater than 1000m, 500-1000m, 200-500m, 100-200m, less than 100m, and land below sea level.
  • Highland Areas:
    • Notable peaks:
    • Ben Nevis: 1344m
    • Scafell Pike: 978m
    • Snowdon: 1085m

Glacial Movement

  • Processes:
    1. Erosion: Glaciers pick up material as they move.
    2. Transportation: Carrying away eroded materials, termed as moraines.

Characteristics and Formation of Glaciers

Processes of Erosion
  • Erosion Methods:
    • Leading to the two primary occurrences of erosion while ice moves.

Formation of a Corrie

  • Process: Snow compacts into glacial ice over time in a north-facing hollow; further deepening occurs via:
    • Abrasion & Plucking: Erodes the ground, steepening walls.
    • Freeze-thaw Weathering: Expands structural weaknesses.
  • After Ice Age: Formation of tarns.

Waves and Coastal Processes

  • Wave Dynamics:
    • Crest: Top of the wave
    • Trough: Bottom of the wave
    • Amplitude: Height from trough to crest.
    • Wavelength: Distance between crests or troughs.
    • Fetch: Length of water surface wind blows over.
Shoreline Processes
  • Swash: Water rushing up the beach.
  • Backwash: Water returning down to the sea.

Types of Waves

Constructive Waves
  • Properties:
    • Build up the beach, known as ‘spilling’ waves.
    • Stronger swash, lower amplitude, longer wavelengths (6-7 waves per minute).
Destructive Waves
  • Properties:
    • Erode the beach, known as ‘plunging’ waves.
    • Stronger backwash, higher amplitude, shorter wavelengths (13-15 waves per minute).

Coastline Types

Discordant Coastlines
  • Examples along the Atlantic:
    • Alternates between harder rocks (e.g., limestone) and softer rocks (e.g., clay).
Concordant Coastlines
  • Examples along the Pacific:
    • Consistent material types: Hard rocks in front of softer rocks (e.g., chalk).

The Long Profile of a River

  • Components: The river's source, upper, middle, lower course, and its mouth.
  • Various elevation measurements highlight the profile at different stages.

Erosion Processes

  • Definition: Wearing away and removal of rocks by water, wind, or ice.
  • Types of Erosion:
    1. Abrasion: Material in the river scraping the bed and banks.
    2. Attrition: Rocks colliding and wearing away.
    3. Hydraulic Action: Water forced into cracks leading to erosion.
    4. Solution: Soluble minerals dissolved in water aiding in erosion.

River Transportation Mechanisms

  • Load: The material carried by the river.
  • Bedload: Heavier materials transported despite water flow.
  • Transportation Types:
    • Saltation: Bouncing along the riverbed.
    • Traction: Rolling of boulders.
    • Suspension: Lighter particles carried within the water.
    • Solution: Dissolved materials in water.

River Course Characteristics

Upper Course
  • Formation: Narrow V-shaped valleys, interlocking spurs, and waterfalls.
    • Energy Levels: Limited energy for lateral erosion; primarily vertical.
    • Rapids Characteristics: Areas of fast-flowing, turbulent water.
Middle Course
  • Features:
    • Wide, flat floodplains, increased energy and volume of water, development of meandering.
Lower Course
  • Rivers in Lowlands:
  • Characteristics: Wide, flat floodplain, easy flooding, alluvium deposits creating levées.

Key Concepts in Urban Dynamics

Population Density Variances
  • Example:
    • London: 5700 people/km²
    • Cornwall: 160 people/km²
  • Implications: Economic and social opportunities, infrastructure adaptation.
Primary, Secondary, Tertiary, and Quaternary Industries
  • Primary: Extracts raw materials.
  • Secondary: Processes and manufactures products.
  • Tertiary: Provides services and sales.
  • Quaternary: Focuses on information and advanced technology.
Deindustrialization in the North East
  • Effects:
    • Closure of factories, land dereliction, skilled labour out-migration, reduced services, and urban decline.
Migration Dynamics in Birmingham
  • Trends:
    • Post-1960s migration from Pakistan, India, Bangladesh for jobs and family reunification.
  • Population Characteristics: Settlement impacts on age structure, housing, services, culture.
Urban Regeneration
  • Impact Analysis: Positive (economic opportunities) and negative (displacement of existing communities).

Evaluation Basics

  • Key Terms:
    • Accuracy: Reliability of data collection methods.
    • Reliability: Consistency of data across multiple collections.
  • Strategies for Improvement: Data collection timing, sampling diversity.

Conclusion of Coastal Management

  • Impacts: Positive community reinforcement and economic confidence through coastal defense initiatives.
  • Insights from Survey: Most locals and tourists perceive coastal management as effective and visually appealing.

Key Learnings for Examination

  • Focus Areas:
    • Coastal processes in Swanage.
    • Types of management and their effectiveness.
    • Community impacts of coastal management.
  • Critical Questions:
    • Assess sustainability of coastal defense strategies in relation to local community satisfaction and environmental integrity.