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OLD-AGE STAGE (LOWER COURSE)


Picture
Click on the image above to open a Google Earth file showing the Yellow River in China meandering on its journey east and and some spectacular ox-bow lakes.

Flood Plains & Levees


Picture

Deltas


Deltas are triangular-shaped areas of land which form at the mouths of rivers. They are made up of alluvium.

When the river reaches the end of its journey and enters the sea it loses its energy and deposits its load on the bed of the sea. If the sea has no tides and weak currents then it cannot wash away these deposits. Overtime the deposits will build up and form a delta at the river's mouth. Soon the river channel becomes choked and the river breaks up into a number of small channels called distribuaries.
Picture
Picture
Picture


Picture
Click here to see an animation of how a delta forms.

Junior Certificate Geography
  • Home
  • TY SPANISH SURVEY
  • First Year
    • What is geography about?
    • Restless Earth >
      • The Earth >
        • Plate Tectonics >
          • Alfred Wegner
          • Plate boundaries
        • Earthquakes >
          • Japan Earthquake 2011
          • Haiti Earthquake
          • Protecting against earthquakes
        • Volcanoes
        • Fold Mountains
        • Rocks
        • How do rocks form?
      • Denudation >
        • Weathering and Mass Movement >
          • Limestone landscapes >
            • The Burren
            • Limestone Podcasts
    • Rivers >
      • Features of a river
      • Work of the river >
        • River erosion
        • River transportation
      • Stages of a river >
        • Youthful Stage
        • Mature Stage
        • Old Age Stage
      • River Flooding >
        • Causes of flooding
        • New Orleans
      • Managing Rivers: Dams
    • Economic activities >
      • COP21
      • Primary Economic Activities >
        • Water >
          • Dublin's Water Supply
          • Irrigation
        • Oil & Gas >
          • Corrib Gas Debate
        • Peat >
          • Exploiting the peat
        • Renewable Energy Sources
        • Over-fishing
        • Farming
        • Primary Industries Project >
          • 3B Presentations
      • Secondary Economic Activities >
        • Types of industry
        • Industrial Change
        • Women at work
    • Settlement >
      • What is a settlement?
      • Location of Settlements
    • Work of the sea >
      • Shaping the coast
      • Coastal erosion >
        • Azure Window
      • Coastal deposition
      • Coastline Management
  • Second Year
    • Economic Inequality >
      • Living in an unequal world >
        • Sierra Leone
    • Population >
      • Population Change
      • Factors influencing population change
      • Population Density >
        • Brazil's Population Density
        • Population Density in Ireland
        • Low Population Density
        • High Population Density - Problems
        • Population Density Presentation
      • Migration
    • The work of ice >
      • How does a glacier form?
      • Glacial erosion >
        • How are corries formed?
      • How do glaciers transport material?
      • Human activity in glacial areas
    • Weather & Climate >
      • Types of rainfall
      • Factors that affect climate
      • Ocean Currents
      • Climate Graphs
      • Climate & Environments
  • Third Year
    • Settlement
    • Urbanisation >
      • What is urbanisation?
      • Growth of Dublin
      • Functional Zones of the City
      • Residential Environments
      • Urban Solutions
      • Urban Redevelopment
      • Urbanisation Project >
        • Where is Kiberia located?
        • What is life like?
        • What kinds of problems do people face?
        • Are there any solutions?
        • Urbanisation projects links...
      • Urban Dublin
      • Urbanisation Exams & Revision
    • Revision
  • IB Geography
    • Flipboards
    • Extended Essay
    • The Syllabus
    • Patterns & Change >
      • Population in transition >
        • Population change >
          • Investigation of demographic indicators
          • Population projections / momentum
        • High / Low Fertility >
          • Pro-natal policy
        • Gender Equality
      • Disparities in wealth & development >
        • Measures of regional & global disparities >
          • Composite Indicies
        • Origin of disparities >
          • Disparity in Brazil
        • Disparities & Change >
          • Life Expectancy
          • The Millennium Development Goals
        • Reducing Disparities
      • Environment quality & sustainability >
        • Atmosphere & Change >
          • Global Climate
          • Climate Change
        • Soil & Change
        • Biodiversity
      • Patterns in resource consumption >
        • Ecological Footprint
    • Globalisation & Indigenous Populations
    • Health & Food >
      • Food
    • Freshwater >
      • Hydrological Cycle
      • River Transport & Erosion
      • Fluvial Landforms
      • River Floods - Case-studies >
        • UK Floods 2015
        • Boscastle Floods 2004
        • Pakistan Floods 2010
      • Dams & Reservoirs
      • Wetlands as a water resource
      • Stream management >
        • Flood Management - Bray
      • Competing demands for water
    • Internal Assessment
  • Transition Year
    • TY ICT >
      • ICT?
      • Podcasting
      • Tedx challenge
      • Snr Girls Cup Final
    • Geography >
      • Pirates
      • Plate Tectonics
      • African Cup of Nations
    • Development Studies >
      • Measuring Development
      • Appropriate technology
      • TY Dev Studies Blog
  • Exam papers
  • ICT
  • Starter videos
  • Geography Games
  • New Page
  • Rugby at St Andrew's College