the pleistocene

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  • the pleistocene
    • roughly  every 200-250 years there has been a major period of ice activity
    • glaciars
      • a flowwing stream of ice occupying a valley
    • firn
      • compacted snow that has survived a season of melting an freezing
    • temperature latitude
      • lie between the polar regions and the tropics
    • ice sheets
      • continuious mass of ice and snow of considerable thickness and are over 50000km"
    • global fluctuations
      • global  fluctuation in temperatures up to 1 degree can cause an ice age
    • sun spot acttivity and volcanic dust can also aid ice ages


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