eustatic + isostatic change

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  • Eustatic change and isostatic change
    • tides responsible for daily change
    • many changes took place in quaternary glaciation: advance+ retreat of ice
      • stage 1: climate colder = new glacial period, ^ precipitation as snow > to glacial ice. store of water - slowing of hydrological cycle
        • sea -level falls across globe -  known as eustatic fall
      • stage 2: weight of ice sinks land surface ( not all areas affected)
        • This movement is isostatic (and moderates the eustatic fall in areas)
      • Stage 3: climate gets warmer. ice begnis to melt. replenishes main source =  global sea-level rise( eustatic)
        • floods many  areas of low land = submergent features >flooded river valleys (rais)
      • Stage 4: as ice removed land readjusts to previous level (isostatic)
        • if readjustment = quiter than eustatic > emergent features i.e. raised beaches
    • as mean global temp continues to ^ inevitable consequence for sea levels

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